Update flake8-quotes from 0.13.0 to 0.14.0

Author: pyup-bot

dev-requirements.txt

@@ -3,7 +3,7 @@ check-manifest==0.36
 codecov==2.0.15 # Upload coverage data
 dodgy==0.1.9  # Look for uploaded secrets
 flake8==3.5.0  # Lint
-flake8-quotes==0.13.0  # Require single quotes
+flake8-quotes==0.14.0  # Require single quotes
 freezegun==0.3.9  # Freeze time in tests
 hypothesis==3.45.0  # Generate test cases
 isort==4.3.4  # Lint imports