Add supported python versions to readme via shield.

[BenediktBurger]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.52%. Comparing base (54bda60) to head (10059ef).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #103   +/-   ##
=======================================
  Coverage   89.52%   89.52%           
=======================================
  Files          38       38           
  Lines        2988     2988           
  Branches      312      312           
=======================================
  Hits         2675     2675           
  Misses        262      262           
  Partials       51       51           

Flag	Coverage Δ
unittests	89.52% <ø> (ø)

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