++++++++++++++++++
* Drop Django support for non-LTS and non-latest Django (so, removing 1.x, 2.0, 2.1, 3.0, 3.1)
* Drop support for older Python releases (2.x, 3.5)
* Add Django 4.0 to tox's test matrix
* Add Python 3.7 through 3.10 to tox's test matrix; 3.6 to 3.10 are now the only tested versions
* Switch CI to Github Actions