Add RELEASES.md.

[briansmith]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.58%. Comparing base (7b06be8) to head (9a38dc8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2453      +/-   ##
==========================================
- Coverage   96.59%   96.58%   -0.01%     
==========================================
  Files         180      180              
  Lines       21748    21748              
  Branches      538      538              
==========================================
- Hits        21007    21006       -1     
  Misses        623      623              
- Partials      118      119       +1     

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