Update readme

[sungam3r]

Badges are aligned with those from other repos.

[sungam3r]

Previous build on master failed to upload coverage:

2023-04-20T15:34:50.205Z] ['error'] There was an error running the uploader: Error uploading to https://codecov.io: Error: There was an error fetching the storage URL during POST: 404 - {'detail': ErrorDetail(string='Unable to locate build via Github Actions API. Please upload with the Codecov repository upload token to resolve issue.', 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.23%. Comparing base (7b0e9da) to head (856626b).
⚠️ Report is 72 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #308   +/-   ##
=======================================
  Coverage   96.23%   96.23%           
=======================================
  Files          85       85           
  Lines        4889     4889           
  Branches      475      475           
=======================================
  Hits         4705     4705           
  Misses        184      184           

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