Add Django 5.1, remove Python 3.5, Release 0.15.0

[sdolemelipone]

Added support for Django 5.1 and release.

Also removed tests for Python 3.5 support as it's no longer supported by the @setup-python github action.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.77%. Comparing base (9a6bf95) to head (9ba187e).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #269   +/-   ##
=======================================
  Coverage   88.77%   88.77%           
=======================================
  Files           6        6           
  Lines         490      490           
  Branches       50       50           
=======================================
  Hits          435      435           
  Misses         40       40           
  Partials       15       15           

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