Add release note for deprecation of CalendarDateTime

[spencerkclark]

🚀 Pull Request

I forgot to add a note to the release notes in #87; this corrects that.

[codecov-commenter]

Codecov Report

Merging #90 (d413ca0) into main (5f2c4dc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #90   +/-   ##
=======================================
  Coverage   94.32%   94.32%           
=======================================
  Files           1        1           
  Lines         194      194           
  Branches       44       44           
=======================================
  Hits          183      183           
  Misses          6        6           
  Partials        5        5           

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