Add support for official django version

[irtazaakram]

Hi,

I’ve made this PR that

• add support for Django 3.2, 4.1 & 4.2
• drop support for Python 3.6, 3.7 (EOL https://devguide.python.org/versions/#unsupported-versions)
• drop support for Django 2.2, 3.0 (EOL https://www.djangoproject.com/download/#unsupported-versions)

can we also have a new release after this PR is merged?

Thanks,

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (cb749a8) 100.00% compared to head (6d40fec) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #266   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            4         4           
  Lines          109       109           
  Branches        14        14           
=========================================
  Hits           109       109           

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