Add py37 support and update project config

[blink1073]

Fixes #29

[codecov]

Codecov Report

Base: 94.04% // Head: 94.04% // No change to project coverage 👍

Coverage data is based on head (731be25) compared to base (9f28fea).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #31   +/-   ##
=======================================
  Coverage   94.04%   94.04%           
=======================================
  Files          11       11           
  Lines         504      504           
=======================================
  Hits          474      474           
  Misses         30       30           

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