Merge pull request #390 from src-d/dependabot/pip/flake8-import-order-0.18.1

Bump flake8-import-order from 0.18 to 0.18.1

Author: vmarkovtsev

requirements-lint.txt

@@ -1,7 +1,7 @@
 flake8==3.5.0
 flake8-bugbear==18.8.0
 flake8-docstrings==1.3.0
-flake8-import-order==0.18
+flake8-import-order==0.18.1
 flake8-quotes==1.0.0
 flake8-per-file-ignores==0.8.1
 pylint==2.3.1