docs(changelog): version 1.15.4 [citest skip]

[richm]

Update changelog and .README.html for version 1.15.4

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.22%. Comparing base (34d1f2d) to head (eeefc13).
Report is 12 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #701       +/-   ##
===========================================
+ Coverage   20.50%   43.22%   +22.72%     
===========================================
  Files          10       12        +2     
  Lines        1478     3100     +1622     
  Branches      433        0      -433     
===========================================
+ Hits          303     1340     +1037     
- Misses       1174     1760      +586     
+ Partials        1        0        -1     

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