rtfd

[codingjoe]

• Bump actions/setup-python from 3 to 4
• Add readthedocs config file

[codecov]

Codecov Report

Merging #43 (1109b9d) into master (738f429) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #43   +/-   ##
=======================================
  Coverage   91.24%   91.24%           
=======================================
  Files          16       16           
  Lines         697      697           
=======================================
  Hits          636      636           
  Misses         61       61           

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