update CHANGELOG.md

[cscherrer]

Here's something LLMs are pretty good at:

1. Create a diff using git diff master...release/v0.19.0 > release19.diff
2. Tell the LLM "Use release19.diff to update CHANGELOG.md"

This makes it easy to update this PR. then we can just have a quick look before merging release/v0.19.0 into master

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.87%. Comparing base (4fce1d1) to head (b0cbd82).
Report is 1 commits behind head on release/v0.19.0.

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v0.19.0      #19   +/-   ##
================================================
  Coverage            80.86%   80.87%           
================================================
  Files                   98       98           
  Lines                19396    19396           
  Branches             19396    19396           
================================================
+ Hits                 15685    15686    +1     
+ Misses                3612     3611    -1     
  Partials                99       99           

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