docs(changelog): version 1.18.6 [citest skip]

[richm]

Update changelog and .README.html for version 1.18.6

Signed-off-by: Rich Megginson rmeggins@redhat.com

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.73%. Comparing base (e6cab70) to head (8541ee3).
Report is 5 commits behind head on main.

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HEAD has 1 upload less than BASE

Flag	BASE (e6cab70)	HEAD (8541ee3)
sanity	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #479      +/-   ##
==========================================
- Coverage   16.54%   10.73%   -5.81%     
==========================================
  Files           2        8       +6     
  Lines         284     1946    +1662     
  Branches       79        0      -79     
==========================================
+ Hits           47      209     +162     
- Misses        237     1737    +1500     

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