-r requirements.txt
coverage==4.5.2
coveralls==1.5.1
flake8==3.5.0
flake8-per-file-ignores==0.8.1
mock==2.0.0
pytest==4.2.1
pytest-cov==2.6.1

-r requirements.txt
coverage==4.5.2
coveralls==1.5.1
flake8==3.7.5
flake8-per-file-ignores==0.8.1
mock==2.0.0
pytest==4.2.1
pytest-cov==2.6.1

Update flake8 from 3.5.0 to 3.7.5
Update flake8 from 3.5.0 to 3.7.5
