-r requirements.txt
flake8==3.6.0
pytest==4.0.2
pytest-cov==2.6.0

-r requirements.txt
flake8==3.6.0
pytest==4.0.2
pytest-cov==2.6.1

Update pytest-cov from 2.6.0 to 2.6.1
Update pytest-cov from 2.6.0 to 2.6.1