Django-howl

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* add support for python 3.9
* add support for django 3.0 and 3.1
* drop support for python < 3.6
* drop support for django < 2.2


1.0.x
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* add support for python 3.7 and 3.8
* update Pipfile.lock and test environment to avoid security issues
* use github actions

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* increase Django version
* update Pipfile.lock and test environment to avoid security issues

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* add more documentation

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* increase test coverage
* update requirements and dev packages
* use flake8 instead of pep8 and flakes

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* Fix: add missing on_delete argument to migration