Django-cors-headers

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* Update LICENSE file to Unix line endings, fixing issues with license checker
``pip-licenses`` (`Issue
477 <https://github.com/adamchainz/django-cors-headers/issues/477>`__).

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* 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-cors-headers")``
(`docs <https://docs.python.org/3.8/library/importlib.metadata.html#distribution-versions>`__ /
`backport <https://pypi.org/project/importlib-metadata/>`__).
* Support Python 3.8.

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* Support the value `file://` for origins, which is accidentally sent by some
versions of Chrome on Android.

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* Drop Python 2 support, only Python 3.5-3.7 is supported now.
* Fix all links for move from ``github.com/ottoyiu/django-cors-headers`` to
``github.com/adamchainz/django-cors-headers``.

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* Add a hint to the ``corsheaders.E013`` check to make it more obvious how to
resolve it.

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* Allow 'null' in ``CORS_ORIGIN_WHITELIST`` check.