Prepare for version 0.3.1

[bhazelton]

Description

Need to get out a new version!

Motivation and Context

Checklists:

Version Change Checklist

• I have read the contribution guide.
• My code follows the code style of this project.
• I have updated the CHANGELOG to put all the unreleased changes under the new version (leaving the unreleased section empty).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4a8b172) 100.00% compared to head (b59c4b7) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #233   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines         2134      2134           
  Branches       608       608           
=========================================
  Hits          2134      2134           

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