Add meta data as comment

[brainelectronics]

• add comment with meta data below every changelog entry for later parsing, closes Add meta comment to changelog entries #16
• update README badge to show support for Python 3.9 - 3.11 instead of generic Python 3

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.33%. Comparing base (2b93c08) to head (37a58ad).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage   83.33%   83.33%           
=======================================
  Files           1        1           
  Lines          36       36           
  Branches        8        8           
=======================================
  Hits           30       30           
  Misses          4        4           
  Partials        2        2           

Flag	Coverage Δ
unittests	83.33% <ø> (ø)

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[brainelectronics]

LGTMyself