Update README.md: Release 0.4.0

[uellue]

Update changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.17%. Comparing base (3b62dd1) to head (7e06167).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #54   +/-   ##
=======================================
  Coverage   51.17%   51.17%           
=======================================
  Files           1        1           
  Lines         594      594           
  Branches      114      114           
=======================================
  Hits          304      304           
  Misses        275      275           
  Partials       15       15           

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