docs(changelog): version 1.18.0 [citest skip]

[richm]

Update changelog and .README.html for version 1.18.0

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.76%. Comparing base (bb51979) to head (9a32e64).
Report is 4 commits behind head on main.

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HEAD has 1 upload less than BASE

Flag	BASE (bb51979)	HEAD (9a32e64)
sanity	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #459      +/-   ##
==========================================
- Coverage   16.54%   10.76%   -5.79%     
==========================================
  Files           2        8       +6     
  Lines         284     1942    +1658     
  Branches       79        0      -79     
==========================================
+ Hits           47      209     +162     
- Misses        237     1733    +1496     

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