Django-cors-headers

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* Add type hints.

* 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.

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* Following Django’s example in
`Ticket 31670 <https://code.djangoproject.com/ticket/31670>`__ for replacing
the term “whitelist”, plus an aim to make the setting names more
comprehensible, the following settings have been renamed:

* ``CORS_ORIGIN_WHITELIST`` -> ``CORS_ALLOWED_ORIGINS``
* ``CORS_ORIGIN_REGEX_WHITELIST`` -> ``CORS_ALLOWED_ORIGIN_REGEXES``
* ``CORS_ORIGIN_ALLOW_ALL`` -> ``CORS_ALLOW_ALL_ORIGINS``

The old names will continue to work as aliases, with the new ones taking
precedence.

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* Add Django 3.1 support.

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* Drop Django 1.11 support. Only Django 2.0+ is supported now.
* Drop the ``providing_args`` argument from ``Signal`` to prevent a deprecation
warning on Django 3.1.