diff --git a/.appveyor.yml b/.appveyor.yml
deleted file mode 100644
index c896446..0000000
--- a/.appveyor.yml
+++ /dev/null
@@ -1,102 +0,0 @@
-version: '{branch}-{build}'
-
-os:
-  - Visual Studio 2015
-
-branches:
-  only:
-    - main
-
-environment:
-  matrix:
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      GENERATOR: Visual Studio 15 2017
-      platform: x86
-      configuration: Debug
-
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      GENERATOR: Visual Studio 15 2017
-      platform: x86
-      configuration: Release
-
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      GENERATOR: Visual Studio 15 2017
-      platform: x64
-      configuration: Debug
-
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      GENERATOR: Visual Studio 15 2017
-      platform: x64
-      configuration: Release
-
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      GENERATOR: Visual Studio 15 2017 Win64
-      platform: x86
-      configuration: Debug
-
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      GENERATOR: Visual Studio 15 2017 Win64
-      platform: x86
-      configuration: Release
-
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      GENERATOR: Visual Studio 15 2017 Win64
-      platform: x64
-      configuration: Debug
-
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      GENERATOR: Visual Studio 15 2017 Win64
-      platform: x64
-      configuration: Release
-
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      GENERATOR: Visual Studio 16 2019
-      platform: x86
-      configuration: Debug
-
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      GENERATOR: Visual Studio 16 2019
-      platform: x86
-      configuration: Release
-
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      GENERATOR: Visual Studio 16 2019
-      platform: x64
-      configuration: Debug
-
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      GENERATOR: Visual Studio 16 2019
-      platform: x64
-      configuration: Release
-
-    - GENERATOR: MinGW Makefiles
-      BINDIR: C:\MinGW\bin
-
-    - GENERATOR: MinGW Makefiles
-      COMPILER: MinGW 5
-      BINDIR: C:\mingw-w64\i686-5.3.0-posix-dwarf-rt_v4-rev0\mingw32\bin
-
-    - GENERATOR: MinGW Makefiles
-      COMPILER: MinGW 6
-      BINDIR: C:\mingw-w64\i686-6.3.0-posix-dwarf-rt_v5-rev1\mingw32\bin
-
-    - GENERATOR: MinGW Makefiles
-      COMPILER: MinGW 6
-      BINDIR: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin
-
-init: []
-
-install: []
-
-before_build:
-- if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2015" (del "C:\Program Files (x86)\MSBuild\14.0\Microsoft.Common.targets\ImportAfter\Xamarin.Common.targets")
-- if defined BINDIR (set "PATH=%BINDIR%;%PATH:C:\Program Files\Git\usr\bin;=%")
-- md build
-- cd build
-- cmake -Wno-dev --config "%CONFIGURATION%" -G "%GENERATOR%" ..
-
-build_script:
-- cmake --build . --config "%CONFIGURATION%"
-
-test_script:
-- ctest -C "%CONFIGURATION%" --output-on-failure
diff --git a/.clang-format b/.clang-format
index 729f882..71aac94 100644
--- a/.clang-format
+++ b/.clang-format
@@ -1,9 +1,16 @@
-# the official .clang-format style for https://github.com/taocpp
+# The Art of C++
+# https://github.com/taocpp
+
+# Copyright (c) 2016-2025 Dr. Colin Hirsch and Daniel Frey
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
+
+# This is our official .clang-format style for https://github.com/taocpp
 #
 # clang-format -i -style=file $(find . -name '[^.]*.[hc]pp')
 
 Language: Cpp
-Standard: Cpp11
+Standard: Latest
 
 AccessModifierOffset: -3
 AlignAfterOpenBracket: Align
diff --git a/.clang-tidy b/.clang-tidy
index 8e6dc1b..fc1c51e 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -1,5 +1,18 @@
+# The Art of C++
+# https://github.com/taocpp
+
+# Copyright (c) 2016-2025 Dr. Colin Hirsch and Daniel Frey
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
+
+# Note: The misc-include-cleaner is generally useful,
+# but produces false positives with Oid/InvalidOid and libpq-fe.h.
+# For that reason it is disabled, but it should be enabled
+# manually from time to time.
+
 Checks: >-
   bugprone-*,
+  -bugprone-easily-swappable-parameters,
   cppcoreguidelines-slicing,
   cppcoreguidelines-special-member-functions,
   google-build-explicit-make-pair,
@@ -7,10 +20,11 @@ Checks: >-
   google-default-arguments,
   google-global-names-in-headers,
   google-readability-casting,
+  llvm-*,
   misc-*,
+  -misc-include-cleaner,
   -misc-non-private-member-variables-in-classes,
   -misc-unused-alias-decls,
-  llvm-*,
   modernize-*,
   -modernize-avoid-c-arrays,
   -modernize-concat-nested-namespaces,
@@ -18,7 +32,10 @@ Checks: >-
   performance-*,
   readability-*,
   -readability-avoid-const-params-in-decls,
+  -readability-function-cognitive-complexity,
+  -readability-identifier-length,
   -readability-magic-numbers,
+  -readability-non-const-parameter,
 
 CheckOptions:
   - { key: readability-identifier-naming.ClassCase,     value: lower_case }
diff --git a/.github/workflows/clang-format.yml b/.github/workflows/clang-format.yml
new file mode 100644
index 0000000..25a1fa0
--- /dev/null
+++ b/.github/workflows/clang-format.yml
@@ -0,0 +1,19 @@
+name: clang-format
+
+on:
+  push:
+    paths-ignore:
+      - 'README.md'
+  pull_request:
+    paths-ignore:
+      - 'README.md'
+
+jobs:
+  clang-format:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - uses: DoozyX/clang-format-lint-action@v0.18
+      with:
+        extensions: 'hpp,cpp'
diff --git a/.github/workflows/clang-tidy.yml b/.github/workflows/clang-tidy.yml
new file mode 100644
index 0000000..5a813a2
--- /dev/null
+++ b/.github/workflows/clang-tidy.yml
@@ -0,0 +1,22 @@
+name: clang-tidy
+
+on:
+  push:
+    paths-ignore:
+      - 'README.md'
+  pull_request:
+    paths-ignore:
+      - 'README.md'
+
+jobs:
+  clang-tidy:
+    runs-on: ubuntu-24.04
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - run: sudo apt-get update -yq
+
+    - run: sudo apt-get install -yq clang-tidy
+
+    - run: find include/ src/ -name '*.?pp' | xargs -I '{}' clang-tidy --quiet '{}' -- -Iinclude
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
new file mode 100644
index 0000000..d80342b
--- /dev/null
+++ b/.github/workflows/linux.yml
@@ -0,0 +1,41 @@
+name: Linux
+
+on:
+  push:
+    paths-ignore:
+      - 'README.md'
+  pull_request:
+    paths-ignore:
+      - 'README.md'
+
+jobs:
+  linux-next:
+    strategy:
+      fail-fast: false
+      matrix:
+        compiler:
+          - g++-13
+          - g++-14
+          - clang++-16
+          - clang++-17
+          - clang++-18
+        build_type: [Debug, Release]
+
+    runs-on: ubuntu-24.04
+
+    env:
+      CXX: ${{ matrix.compiler }}
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - run: cmake -E make_directory build
+
+    - working-directory: build/
+      run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
+
+    - working-directory: build/
+      run: cmake --build .
+
+    - working-directory: build/
+      run: ctest --output-on-failure
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
new file mode 100644
index 0000000..d8d3dd5
--- /dev/null
+++ b/.github/workflows/macos.yml
@@ -0,0 +1,33 @@
+name: macOS
+
+on:
+  push:
+    paths-ignore:
+      - 'README.md'
+  pull_request:
+    paths-ignore:
+      - 'README.md'
+
+jobs:
+  xcode-macos-14:
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode: ['15']
+        build_type: [Debug, Release]
+
+    runs-on: macos-14
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - run: cmake -E make_directory build
+
+    - working-directory: build/
+      run: cmake $GITHUB_WORKSPACE
+
+    - working-directory: build/
+      run: cmake --build . --config ${{ matrix.build_type }}
+
+    - working-directory: build/
+      run: ctest --output-on-failure
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
new file mode 100644
index 0000000..9af6bd6
--- /dev/null
+++ b/.github/workflows/windows.yml
@@ -0,0 +1,56 @@
+name: Windows
+
+on:
+  push:
+    paths-ignore:
+      - 'README.md'
+  pull_request:
+    paths-ignore:
+      - 'README.md'
+
+jobs:
+  vs2022:
+    strategy:
+      fail-fast: false
+      matrix:
+        build_type: [Debug, Release]
+
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - run: cmake -E make_directory build
+
+    - shell: bash
+      working-directory: build/
+      run: cmake $GITHUB_WORKSPACE -G "Visual Studio 17 2022"
+
+    - working-directory: build/
+      run: cmake --build . --config ${{ matrix.build_type }}
+
+    - working-directory: build/
+      run: ctest --output-on-failure
+
+  vs2022-clang:
+    strategy:
+      fail-fast: false
+      matrix:
+        build_type: [Debug, Release]
+
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - run: cmake -E make_directory build
+
+    - shell: bash
+      working-directory: build/
+      run: cmake $GITHUB_WORKSPACE -G "Visual Studio 17 2022" -T ClangCL
+
+    - working-directory: build/
+      run: cmake --build . --config ${{ matrix.build_type }}
+
+    - working-directory: build/
+      run: ctest --output-on-failure
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index fd45b03..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,665 +0,0 @@
-language: generic
-os: linux
-dist: xenial
-
-matrix:
-  include:
-    - compiler: gcc
-      addons:
-        apt:
-          packages: ['g++-4.8']
-      env:
-        - CXX=g++-4.8
-        - CXXSTD=-std=c++11
-
-    - compiler: gcc
-      addons:
-        apt:
-          packages: ['g++-4.8']
-      env:
-        - CXX=g++-4.8
-        - CXXSTD=-std=c++1y
-
-    - compiler: gcc
-      addons:
-        apt:
-          packages: ['g++-4.9']
-      env:
-        - CXX=g++-4.9
-        - CXXSTD=-std=c++11
-
-    - compiler: gcc
-      addons:
-        apt:
-          packages: ['g++-4.9']
-      env:
-        - CXX=g++-4.9
-        - CXXSTD=-std=c++14
-
-    - compiler: gcc
-      addons:
-        apt:
-          packages: ['g++-5']
-      env:
-        - CXX=g++-5
-        - CXXSTD=-std=c++11
-
-    - compiler: gcc
-      addons:
-        apt:
-          packages: ['g++-5']
-      env:
-        - CXX=g++-5
-        - CXXSTD=-std=c++14
-
-    - compiler: gcc
-      addons:
-        apt:
-          packages: ['g++-5']
-      env:
-        - CXX=g++-5
-        - CXXSTD=-std=c++1z
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-6']
-      env:
-        - CXX=g++-6
-        - CXXSTD=-std=c++11
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-6']
-      env:
-        - CXX=g++-6
-        - CXXSTD=-std=c++14
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-6']
-      env:
-        - CXX=g++-6
-        - CXXSTD=-std=c++17
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-7']
-      env:
-        - CXX=g++-7
-        - CXXSTD=-std=c++11
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-7']
-      env:
-        - CXX=g++-7
-        - CXXSTD=-std=c++14
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-7']
-      env:
-        - CXX=g++-7
-        - CXXSTD=-std=c++17
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-8']
-      env:
-        - CXX=g++-8
-        - CXXSTD=-std=c++11
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-8']
-      env:
-        - CXX=g++-8
-        - CXXSTD=-std=c++14
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-8']
-      env:
-        - CXX=g++-8
-        - CXXSTD=-std=c++17
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-9']
-      env:
-        - CXX=g++-9
-        - CXXSTD=-std=c++11
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-9']
-      env:
-        - CXX=g++-9
-        - CXXSTD=-std=c++14
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-9']
-      env:
-        - CXX=g++-9
-        - CXXSTD=-std=c++17
-
-    - dist: bionic
-      compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-10']
-      env:
-        - CXX=g++-10
-        - CXXSTD=-std=c++17
-
-    - dist: precise
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++11
-
-    - dist: precise
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++1y
-
-    - compiler: clang
-      addons:
-        apt:
-          packages: ['clang-3.5']
-      env:
-        - CXX=clang++-3.5
-        - CXXSTD=-std=c++11
-
-    - compiler: clang
-      addons:
-        apt:
-          packages: ['clang-3.6']
-      env:
-        - CXX=clang++-3.6
-        - CXXSTD=-std=c++11
-
-    - compiler: clang
-      addons:
-        apt:
-          packages: ['clang-3.6']
-      env:
-        - CXX=clang++-3.6
-        - CXXSTD=-std=c++14
-
-    - compiler: clang
-      addons:
-        apt:
-          packages: ['clang-3.7']
-      env:
-        - CXX=clang++-3.7
-        - CXXSTD=-std=c++11
-
-    - compiler: clang
-      addons:
-        apt:
-          packages: ['clang-3.7']
-      env:
-        - CXX=clang++-3.7
-        - CXXSTD=-std=c++14
-
-    - compiler: clang
-      addons:
-        apt:
-          packages: ['clang-3.7']
-      env:
-        - CXX=clang++-3.7
-        - CXXSTD=-std=c++1z
-
-    - compiler: clang
-      addons:
-        apt:
-          packages: ['clang-3.8']
-      env:
-        - CXX=clang++-3.8
-        - CXXSTD=-std=c++11
-
-    - compiler: clang
-      addons:
-        apt:
-          packages: ['clang-3.8']
-      env:
-        - CXX=clang++-3.8
-        - CXXSTD=-std=c++14
-
-    - compiler: clang
-      addons:
-        apt:
-          packages: ['clang-3.8']
-      env:
-        - CXX=clang++-3.8
-        - CXXSTD=-std=c++1z
-
-    - compiler: clang
-      addons:
-        apt:
-          packages: ['clang-3.9']
-      env:
-        - CXX=clang++-3.9
-        - CXXSTD=-std=c++11
-
-    - compiler: clang
-      addons:
-        apt:
-          packages: ['clang-3.9']
-      env:
-        - CXX=clang++-3.9
-        - CXXSTD=-std=c++14
-
-    - compiler: clang
-      addons:
-        apt:
-          packages: ['clang-3.9']
-      env:
-        - CXX=clang++-3.9
-        - CXXSTD=-std=c++1z
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-4.0']
-          packages: ['clang-4.0']
-      env:
-        - CXX=clang++-4.0
-        - CXXSTD=-std=c++11
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-4.0']
-          packages: ['clang-4.0']
-      env:
-        - CXX=clang++-4.0
-        - CXXSTD=-std=c++14
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-4.0']
-          packages: ['clang-4.0']
-      env:
-        - CXX=clang++-4.0
-        - CXXSTD=-std=c++1z
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-5.0']
-          packages: ['clang-5.0']
-      env:
-        - CXX=clang++-5.0
-        - CXXSTD=-std=c++11
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-5.0']
-          packages: ['clang-5.0']
-      env:
-        - CXX=clang++-5.0
-        - CXXSTD=-std=c++14
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-5.0']
-          packages: ['clang-5.0']
-      env:
-        - CXX=clang++-5.0
-        - CXXSTD=-std=c++17
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-6.0']
-          packages: ['clang-6.0']
-      env:
-        - CXX=clang++-6.0
-        - CXXSTD=-std=c++11
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-6.0']
-          packages: ['clang-6.0']
-      env:
-        - CXX=clang++-6.0
-        - CXXSTD=-std=c++14
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-6.0']
-          packages: ['clang-6.0']
-      env:
-        - CXX=clang++-6.0
-        - CXXSTD=-std=c++17
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-7']
-          packages: ['clang-7']
-      env:
-        - CXX=clang++-7
-        - CXXSTD=-std=c++11
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-7']
-          packages: ['clang-7']
-      env:
-        - CXX=clang++-7
-        - CXXSTD=-std=c++14
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-7']
-          packages: ['clang-7']
-      env:
-        - CXX=clang++-7
-        - CXXSTD=-std=c++17
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-8']
-          packages: ['clang-8']
-      env:
-        - CXX=clang++-8
-        - CXXSTD=-std=c++11
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-8']
-          packages: ['clang-8']
-      env:
-        - CXX=clang++-8
-        - CXXSTD=-std=c++14
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-8']
-          packages: ['clang-8']
-      env:
-        - CXX=clang++-8
-        - CXXSTD=-std=c++17
-
-    - compiler: clang
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-9 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-          packages:
-            - clang-9
-      env:
-        - CXX=clang++-9
-        - CXXSTD=-std=c++11
-
-    - compiler: clang
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-9 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-          packages:
-            - clang-9
-      env:
-        - CXX=clang++-9
-        - CXXSTD=-std=c++14
-
-    - compiler: clang
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-9 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-          packages:
-            - clang-9
-      env:
-        - CXX=clang++-9
-        - CXXSTD=-std=c++17
-
-    - compiler: clang
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-          packages:
-            - clang-10
-      env:
-        - CXX=clang++-10
-        - CXXSTD=-std=c++11
-
-    - compiler: clang
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-          packages:
-            - clang-10
-      env:
-        - CXX=clang++-10
-        - CXXSTD=-std=c++14
-
-    - compiler: clang
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-          packages:
-            - clang-10
-      env:
-        - CXX=clang++-10
-        - CXXSTD=-std=c++17
-
-    - os: osx
-      osx_image: xcode6.4
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++11
-
-    - os: osx
-      osx_image: xcode6.4
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++14
-
-    - os: osx
-      osx_image: xcode6.4
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++1z
-
-    - os: osx
-      osx_image: xcode7.3
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++11
-
-    - os: osx
-      osx_image: xcode8.3
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++11
-
-    - os: osx
-      osx_image: xcode9.4
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++11
-
-    - os: osx
-      osx_image: xcode9.4
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++14
-
-    - os: osx
-      osx_image: xcode9.4
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++17
-
-    - os: osx
-      osx_image: xcode10.3
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++11
-
-    - os: osx
-      osx_image: xcode10.3
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++14
-
-    - os: osx
-      osx_image: xcode10.3
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++17
-
-    - os: osx
-      osx_image: xcode11.4
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++11
-
-    - os: osx
-      osx_image: xcode11.4
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++14
-
-    - os: osx
-      osx_image: xcode11.4
-      compiler: clang
-      env:
-        - CXX=clang++
-        - CXXSTD=-std=c++17
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-8']
-          packages: ['clang-8', 'clang-tools-8']
-      env:
-        - CXX=clang++-8
-      script:
-        - $CXX --version
-        - make -j3 build/src/test/seq/tester
-        - build/src/test/seq/tester
-        - scan-build-8 make -kj3
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-8']
-          packages: ['clang-8', 'clang-tidy-8']
-      env:
-        - CLANG_TIDY=clang-tidy-8
-        - CXXSTD=-std=c++11
-      script:
-        - make -kj3 clang-tidy
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-8']
-          packages: ['clang-8', 'clang-tidy-8']
-      env:
-        - CLANG_TIDY=clang-tidy-8
-        - CXXSTD=-std=c++14
-      script:
-        - make -kj3 clang-tidy
-
-    - compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-8']
-          packages: ['clang-8', 'clang-tidy-8']
-      env:
-        - CLANG_TIDY=clang-tidy-8
-        - CXXSTD=-std=c++17
-      script:
-        - make -kj3 clang-tidy
-
-    - compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-6']
-      env:
-        - CXX=g++-6
-      script:
-        - $CXX --version
-        - mkdir build
-        - cd build
-        - cmake ..
-        - cmake --build .
-        - cmake --build . --target test
-
-script:
-  - $CXX --version
-  - make -j3 build/src/test/seq/tester
-  - build/src/test/seq/tester
-  - make -kj3
diff --git a/README.md b/README.md
index 5724709..3e4e851 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,9 @@
 # The Art of C++ / Sequences
 
 [![Release](https://img.shields.io/github/release/taocpp/sequences.svg)](https://github.com/taocpp/sequences/releases/latest)
-[![Download](https://api.bintray.com/packages/conan/conan-center/taocpp-sequences%3A_/images/download.svg)](https://bintray.com/conan/conan-center/taocpp-sequences%3A_/_latestVersion)
-[![TravisCI](https://travis-ci.org/taocpp/sequences.svg)](https://travis-ci.org/taocpp/sequences)
-[![AppVeyor](https://ci.appveyor.com/api/projects/status/github/taocpp/sequences?svg=true)](https://ci.appveyor.com/project/taocpp/sequences)
+[![Windows CI](https://github.com/taocpp/sequences/workflows/Windows/badge.svg)](https://github.com/taocpp/sequences/actions?query=workflow%3AWindows)
+[![macOS CI](https://github.com/taocpp/sequences/workflows/macOS/badge.svg)](https://github.com/taocpp/sequences/actions?query=workflow%3AmacOS)
+[![Linux CI](https://github.com/taocpp/sequences/workflows/Linux/badge.svg)](https://github.com/taocpp/sequences/actions?query=workflow%3ALinux)
 
 [The Art of C++](https://taocpp.github.io/) / Sequences is a zero-dependency C++11 header-only library that provides efficient algorithms to generate and work on variadic templates and [`std::integer_sequence`](http://en.cppreference.com/w/cpp/utility/integer_sequence).