add deps for django-redirect-urls + tests

[bookshelfdave]

ping @jwhitlock

[codecov-io]

Codecov Report

Merging #4217 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4217   +/-   ##
=======================================
  Coverage   86.31%   86.31%           
=======================================
  Files         147      147           
  Lines        9103     9103           
  Branches     1222     1222           
=======================================
  Hits         7857     7857           
  Misses       1005     1005           
  Partials      241      241

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