Remove Django pinning in doc requirements.

[jezdez]

Fix #1049.

Description of the Change

This will fix RTD installing conflicting Django versions.

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[jezdez]

@n2ygk I've also enabled Read The Docs pull request integration so it shows the documentation build status here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.64%. Comparing base (2909e55) to head (3f96bd5).
Report is 226 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1050   +/-   ##
=======================================
  Coverage   96.64%   96.64%           
=======================================
  Files          31       31           
  Lines        1756     1756           
=======================================
  Hits         1697     1697           
  Misses         59       59           

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[jezdez]

If you click on the "Details" link next to the new "docs/readthedocs.org:django-oauth-toolkit" status check, it'll go to the PR-specific docs build. https://django-oauth-toolkit--1050.org.readthedocs.build/en/1050/

[n2ygk]

Hey, thanks!

I had noticed the pinned django version as well in #1049 but this is much better.