Prepare 0.20 release

[jsuereth]

Note: Will wait to merge this for: #1066

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.4%. Comparing base (e32adbf) to head (8066c72).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1069     +/-   ##
=======================================
- Coverage   79.4%   79.4%   -0.1%     
=======================================
  Files         99      99             
  Lines       7346    7346             
=======================================
- Hits        5838    5837      -1     
- Misses      1508    1509      +1     

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