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Maintenance update, some small features and cleanup
* Fixed packaging so that ``testapp/`` and ``tests/`` are no longer packaged
* Dropped support for Django 2.0 and 2.1, added support for Django 3.0
* Added support for Python 3.8
* Depends on django-sendfile2 > 0.5, which went through a package rename from
``sendfile`` to ``django_sendfile``.
* Improved hooks to customize representations