Retroactively Fix Changelog

[peterallenwebb]

Retroactively fix changelog to provide a better explanation of major version bump to 2.0.0.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.86%. Comparing base (4cdc152) to head (ac581a7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #288   +/-   ##
=======================================
  Coverage   71.86%   71.86%           
=======================================
  Files          52       52           
  Lines        3632     3632           
=======================================
  Hits         2610     2610           
  Misses       1022     1022           

Flag	Coverage Δ
unit	71.86% <ø> (ø)

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