Temporary fix for testing Django 2.2

[Andrew-Chen-Wang]

psycopg/psycopg2#1293

[codecov]

Codecov Report

Merging #486 (1ed4f9f) into master (7e93d6c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #486   +/-   ##
=======================================
  Coverage   82.83%   82.83%           
=======================================
  Files          50       50           
  Lines        2051     2051           
=======================================
  Hits         1699     1699           
  Misses        352      352           

Impacted Files	Coverage Δ
silk/urls.py
silk/__init__.py
project/project/__init__.py	60.00% <0.00%> (ø)
project/project/urls.py	100.00% <0.00%> (ø)

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