docs(changelog): version 1.9.0 [citest skip]

[richm]

Update changelog and .README.html for version 1.9.0

Signed-off-by: Rich Megginson [email protected]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.56%. Comparing base (2d7c4ba) to head (c3575fe).
Report is 55 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #263      +/-   ##
==========================================
- Coverage   61.09%   60.56%   -0.54%     
==========================================
  Files           2        2              
  Lines         910      923      +13     
==========================================
+ Hits          556      559       +3     
- Misses        354      364      +10     

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