Github actions to use tox for tests (#117)

* Revive tox.ini

* Test using tox w/ GH actions

* Cleanup

* Update MANIFEST.in

* Bump version

Remove Python 2.7 from PyPi classifiers

Bump the version

Bump the version

Add new Python versions support (#105)

* Add new Python versions support

* Fix 3.10 YAML recognition

* Bump version

Bump version

Merge remote-tracking branch 'origin/master'

Bump version

Bump version

Fix release workflow