-r common.txt
coveralls==1.7.0
mock==2.0.0
pytest==4.3.1
pytest-cov==2.6.1
tox==3.7.0

-r common.txt
coveralls==1.7.0
mock==2.0.0
pytest==4.3.1
pytest-cov==2.6.1
tox==3.8.0

Update tox from 3.7.0 to 3.8.0
Update tox from 3.7.0 to 3.8.0