-r requirements.txt
-r requirements-optional.txt
tox==3.8.4
pytest==4.4.0
coverage==4.5.3

-r requirements.txt
-r requirements-optional.txt
tox==3.8.6
pytest==4.4.0
coverage==4.5.3

Update tox from 3.8.4 to 3.8.6
Update tox from 3.8.4 to 3.8.6