Drop support for Python 3.9

[drhagen]

• Add support for Returns 0.24 and 0.25
• Update copyright year in LICENSE

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2dd49f6) to head (cf357ae).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff            @@
##            master      #124   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           25        25           
  Lines          811       814    +3     
  Branches        87        87           
=========================================
+ Hits           811       814    +3     

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