Update Django version support to match Django's official support

[DmytroLitvinov]

Closes #15

[codecov]

Codecov Report

Merging #16 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #16   +/-   ##
=======================================
  Coverage   98.57%   98.57%           
=======================================
  Files           6        6           
  Lines         211      211           
  Branches       12       12           
=======================================
  Hits          208      208           
  Misses          1        1           
  Partials        2        2           

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[DmytroLitvinov]

Hi @audiolion ,

Seems like TravisCI is not set up for that project.

[audiolion]

Thanks for the PR, I will look into what is happening with TravisCI.

[DmytroLitvinov]

@audiolion , maybe it is related to that issue