Update README.md.

[briansmith]

More disclaimers.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.61%. Comparing base (e58c36f) to head (409bd9c).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2472   +/-   ##
=======================================
  Coverage   96.61%   96.61%           
=======================================
  Files         180      180           
  Lines       21814    21814           
  Branches      539      539           
=======================================
+ Hits        21075    21076    +1     
  Misses        623      623           
+ Partials      116      115    -1     

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