Merge 0449fbd into f2fc9b3

docs/requirements.txt

@@ -13,6 +13,6 @@ tomlkit==0.5.3
 # Dependencies of our linter that should be documented,
 # other dependencies are just ignored or
 # goes to `autodoc_mock_imports` in `conf.py`:
-flake8==3.7.3
+flake8==3.7.4
 typing-extensions==3.7.2
 attrs==18.2.0