use pyproject.toml and remove versioneer

[AurelienJaquier]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.37%. Comparing base (43d63a8) to head (046f2b6). Report is 28 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #500      +/-   ##
==========================================
+ Coverage   87.36%   87.37%   +0.01%     
==========================================
  Files          50       50              
  Lines        4346     4350       +4     
==========================================
+ Hits         3797     3801       +4     
  Misses        549      549              

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