Bump Django 2.2.9

Codecov Report

Merging #607 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #607   +/-   ##
=======================================
  Coverage   85.26%   85.26%           
=======================================
  Files         222      222           
  Lines       13382    13382           
=======================================
  Hits        11410    11410           
  Misses       1972     1972

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merged

mentioned in commit 2c726cc2