-r requirements.txt

pytest==4.2.0
pytest-cov==2.6.1
pytest-mock==1.10.1
codecov==2.0.15
coverage==4.5.2
flake8==3.7.5
black==18.9b0

-r requirements.txt

pytest==4.2.0
pytest-cov==2.6.1
pytest-mock==1.10.1
codecov==2.0.15
coverage==4.5.2
flake8==3.7.7
black==18.9b0

Update flake8 from 3.7.5 to 3.7.7
Update flake8 from 3.7.5 to 3.7.7