fixed: Restore yarn

Author: ZhaoJiSen

.travis.yml

@@ -33,10 +33,10 @@ install:
 - curl -o- -L https://yarnpkg.com/install.sh | bash
 - source ~/.bashrc
 - npm install -g xvfb-maybe
-- pnpm
+- yarn
 script:
 #- xvfb-maybe node_modules/.bin/karma start test/unit/karma.conf.js
-- pnpm run build
+- yarn run build
 branches:
   only:
   - master

appveyor.yml

@@ -21,15 +21,14 @@ init:
 
 install:
   - ps: Install-Product node 20 x64
-  - npm install pnpm -g
   - git reset --hard HEAD
-  - pnpm config set ignore-engines true
-  - pnpm
+  - yarn config set ignore-engines true
+  - yarn
   - node --version
 
 build_script:
   #- yarn test
-  - pnpm build
+  - yarn build
 
 test: off