Support Django 3.1-3.2 and drop EOL Django 2.1

[johnthagen]

Also fix issue introduced in #12, where Python 3.8 CI job was created, but it was not specified to run on new commits/PRs.

[codecov[bot]]

Codecov Report

Merging #17 (35cb78f) into master (c38a3b5) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #17   +/-   ##
=======================================
  Coverage   97.50%   97.50%           
=======================================
  Files           2        2           
  Lines          40       40           
  Branches        5        6    +1     
=======================================
  Hits           39       39           
  Misses          1        1           

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[johnthagen]

Pinging @rpkilby to see if this PR can be reviewed.

[johnthagen]

@rpkilby Friendly ping. 😃

[dmgolembiowski]

This needs more love and attention

[johnthagen]

@rpkilby Would you be able to review this PR? Thanks.

[johnthagen]

@rpkilby Friendly ping to see if this can be reviewed.

[johnthagen]

As the maintainer has not responded in a year, I created a friendly fork that tests against the latest Python and Django versions

https://pypi.org/project/djangorestframework-guardian2/