Update whitenoise to 5.2.0

[pyup-bot]

This PR updates whitenoise from 5.1.0 to 5.2.0.

Changelog

5.2.0

------

* Add support for `relative STATIC_URLs <https://docs.djangoproject.com/en/3.1/ref/settings/std:setting-STATIC_URL>`_
in settings, as allowed in Django 3.1.
* Add mimetype for ``.mjs`` (JavaScript module) files and use recommended
``text/javascript`` mimetype for ``.js`` files (thanks `hanswilw <https://github.com/hanswilw>`_).
* Various documentation improvements (thanks `lukeburden <https://github.com/lukeburden>`_).

Links

• PyPI: https://pypi.org/project/whitenoise
• Changelog: https://pyup.io/changelogs/whitenoise/
• Homepage: http://whitenoise.evans.io

[codecov]

Codecov Report

Merging #146 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #146   +/-   ##
=======================================
  Coverage   93.65%   93.65%           
=======================================
  Files          29       29           
  Lines         898      898           
=======================================
  Hits          841      841           
  Misses         57       57           

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