Fix build

.isort.cfg

@@ -1,8 +1,9 @@
 [settings]
-force_grid_wrap=0
 force_single_line=True
 forced_separate=d1_common,d1_client,django,d1_gmn,d1_test
-include_trailing_comma=True
-line_length=88
+# Compatible with Black
 multi_line_output=3
+include_trailing_comma=True
+force_grid_wrap=0
 use_parentheses=True
+line_length=88

.travis.yml

@@ -5,7 +5,7 @@ dist:
 sudo:
   required
 python:
-  - 3.6
+  - "3.6"
 services:
   - postgresql
 addons:
@@ -48,10 +48,6 @@ script:
   - pytest --cov=. --cov-config .coveragerc --cov-report=term --cov-report=xml -n auto
   # --cov-config=tox.ini
   # --cov-config=coverage.cfg --cov-report=term --cov-report=xml
-  # -n auto
 after_success:
   # Submit results to Coveralls.io.
-  ## Coveralls has a requirement for requests >= 1.0.0, so we install it after
-  ## our packages to prevent it from pulling in the latest version, which is
-  ## likely to conflict with the fixed version our packages pull in.
   - coveralls