Django-settings-file

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* Add type hints.

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* Stop distributing tests to reduce package size. Tests are not intended to be
run outside of the tox setup in the repository. Repackagers can use GitHub's
tarballs per tag.

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* Support Django 3.2.

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* Drop Python 3.5 support.
* Support Python 3.9.
* Drop Django 2.0 and 2.1 support.

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* Add Django 3.1 support.
* Drop Django 1.11 support. Only Django 2.0+ is supported now.

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* Update Python support to 3.5-3.8, as 3.4 has reached its end of life.
* Converted setuptools metadata to configuration file. This meant removing the
``__version__`` attribute from the package. If you want to inspect the
installed version, use
``importlib.metadata.version("django-settings-file")``
(`docs <https://docs.python.org/3.8/library/importlib.metadata.html#distribution-versions>`__ /
`backport <https://pypi.org/project/importlib-metadata/>`__).
* Tested with Django 3.0. No changes were required for compatibility.