Update/readme

[dpvc]

This PR updates the README to v4.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.72%. Comparing base (be4116a) to head (ed43546).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop    #1333     +/-   ##
==========================================
  Coverage    86.72%   86.72%             
==========================================
  Files          337      337             
  Lines        84145    84145             
  Branches      3140     4769   +1629     
==========================================
  Hits         72971    72971             
  Misses       11174    11174             

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