-r requirements.txt
pytest-cov==2.7.1
tox==3.14.0
tox-travis==0.12
codecov==2.0.15
coverage==4.5.4
flake8==3.7.8

-r requirements.txt
pytest-cov==2.8.1
tox==3.14.0
tox-travis==0.12
codecov==2.0.15
coverage==4.5.4
flake8==3.7.8

Update pytest-cov from 2.7.1 to 2.8.1
Update pytest-cov from 2.7.1 to 2.8.1