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Maintenance release
While the library has continued working without issues since 1.0 more than 6 years ago,
it was time for some cleanup. A new major version is released because of the dropped
support for older Python and Django versions, functionally nothing has changed and
upgrading should be straight-forward on modern Python/Django versions.
* Dropped Python 2 support
* Dropped support for Django older than 3.2 (= any end-of-life Django versions)
* Migrated from Travis CI to Github actions
* Restructured project tests and adopted pytest
* Dropped unused dependencies
* Moved from coveralls to Codecov
* Overhauled/restructured documentation and README
* Formatted code with black and isort
* Updated package metadata