Add support for Python 3.10

[hramezani]

it seems nose doesn't work with Python 3.10

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@80822b4). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #163   +/-   ##
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  Coverage          ?   98.89%           
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  Files             ?       17           
  Lines             ?      634           
  Branches          ?       69           
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  Hits              ?      627           
  Misses            ?        4           
  Partials          ?        3           

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[aleksihakli]

Merged into upstream via squash merge, baking a new minor version with new Django and Python version support specifiers.