Update Django to 2.2.9

[rloomans]

No description provided.

[coveralls]

Coverage remained the same at 77.06% when pulling cab6892 on update-django-2.2.9 into 6469125 on master.

[codecov]

Codecov Report

Merging #153 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #153   +/-   ##
=======================================
  Coverage   71.95%   71.95%           
=======================================
  Files          12       12           
  Lines        1248     1248           
  Branches      174      174           
=======================================
  Hits          898      898           
  Misses        284      284           
  Partials       66       66

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