-r common.txt
coveralls==1.3.0
mock==2.0.0
pytest==3.7.1
pytest-cov==2.5.1
tox==3.1.2

-r common.txt
coveralls==1.3.0
mock==2.0.0
pytest==3.7.1
pytest-cov==2.5.1
tox==3.1.3

Update tox from 3.1.2 to 3.1.3
Update tox from 3.1.2 to 3.1.3