Add Python 3.10 support

[klane]

No description provided.

[codecov]

Codecov Report

Merging #226 (998916b) into main (0416208) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #226   +/-   ##
=======================================
  Coverage   35.64%   35.64%           
=======================================
  Files           8        8           
  Lines         491      491           
=======================================
  Hits          175      175           
  Misses        316      316           

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