Version bump 5.3.0

[nijel]

Proposed changes

Release to fix #491

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (PEP8, lint, formatting, renaming, etc)
• Refactoring (no functional changes, no api changes)
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• Lint and unit tests pass locally with my changes
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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.16% 🎉

Comparison is base (2415e07) 93.83% compared to head (5a54f9f) 93.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #492      +/-   ##
==========================================
+ Coverage   93.83%   93.99%   +0.16%     
==========================================
  Files          39       39              
  Lines        1119     1116       -3     
  Branches      130      129       -1     
==========================================
- Hits         1050     1049       -1     
+ Misses         44       43       -1     
+ Partials       25       24       -1     

Flag	Coverage Δ
unittests	93.99% <100.00%> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
social_django/__init__.py	90.00% <100.00%> (+13.07%)	⬆️

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