Release 0.21.7

[tfiedor]

This release mainly updates the readme:

• Fixes some wording;
• Updates information;
• Restructures some parts;
• Updates authors.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ad559a5) 98.60% compared to head (8a64974) 98.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #148      +/-   ##
==========================================
+ Coverage   98.60%   98.61%   +0.01%     
==========================================
  Files         130      130              
  Lines        8597     8599       +2     
==========================================
+ Hits         8477     8480       +3     
+ Misses        120      119       -1     

Flag	Coverage Δ
coverage-3.10	98.59% <100.00%> (+0.01%)	⬆️
coverage-3.11	98.56% <100.00%> (+0.01%)	⬆️
coverage-3.9	98.60% <100.00%> (+<0.01%)	⬆️

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