Dj-tasks

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* handle exception when running individual tasks
* Drop support for django <3.2
* Add support for django 4.0 and 4.1

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* add documentation of ``DJTASKS_LOCK_ID`` to Quickstart
* update MakeFile to use current work flow
* close database connection after each full run
* add dj_tasks.tasks.DeleteOldTaskRunTask
* flake8 fixes
* add twine for easier releases
* move to GitHub Actions from Travis CI
* drop testing with tox

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* require setting ``DJTASKS_LOCK_ID``

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* First release on PyPI.