Release v1.3.1

[darshdinger]

Add changelog entry for v1.3.1 release

This release sets the default heatmap colorscale to 'Jet' instead of the default purple/magenta scale.

Fixes the colormap issue reported in finddata.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.80%. Comparing base (f8f527c) to head (213d4a3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #32   +/-   ##
=======================================
  Coverage   89.80%   89.80%           
=======================================
  Files           3        3           
  Lines         206      206           
=======================================
  Hits          185      185           
  Misses         21       21           

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