[tox]
envlist = py{27,34,35,36,37}

[testenv]
commands =
    python -m unittest discover -s tests -v

[tox]
envlist = py{27,34,35,36,37,38,39}

[testenv]
commands =
    python -m unittest discover -s tests -v

Extend Tox's coverage to Python 3.8 and 3.9
Extend Tox's coverage to Python 3.8 and 3.9
