Use snippets2changelog

[brainelectronics]

• run isort on all files
• drop Python 3.8 support everywhere and update README badge
• add generated changelog.json file to .gitignore
• use latest actions/checkout@v4 and actions/setup-python@v5
• use snippets2changelog package, closes Use snippets2changelog #26

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.16%. Comparing base (1cd1542) to head (92b1221).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   95.16%   95.16%           
=======================================
  Files           3        3           
  Lines         124      124           
  Branches       13       13           
=======================================
  Hits          118      118           
  Misses          3        3           
  Partials        3        3           

Flag	Coverage Δ
unittests	95.16% <100.00%> (ø)

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[brainelectronics]

LGTMyself, ready to work on #28