-r requirements.txt
isort==4.3.4
pytest==3.6.3
pytest-env==0.6.2
pytest-mock==1.10.0
pytest-cov==2.5.1
pytest-xdist==1.22.2
coveralls==1.3.0
httpretty==0.9.5
beautifulsoup4==4.6.0
freezegun==0.3.10
flake8==3.5.0
flake8-print==3.1.0

-r requirements.txt
isort==4.3.4
pytest==3.6.4
pytest-env==0.6.2
pytest-mock==1.10.0
pytest-cov==2.5.1
pytest-xdist==1.22.2
coveralls==1.3.0
httpretty==0.9.5
beautifulsoup4==4.6.0
freezegun==0.3.10
flake8==3.5.0
flake8-print==3.1.0

Update pytest from 3.6.3 to 3.6.4
Update pytest from 3.6.3 to 3.6.4