chore(main): release 3.1.1

[mljs-bot]

🤖 I have created a release beep boop

3.1.1 (2025-07-08)

Performance Improvements

• optimize to2DArray method by only getting non-zeros (#19) (e80f453)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.73%. Comparing base (e80f453) to head (f5170ad).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #20   +/-   ##
=======================================
  Coverage   71.73%   71.73%           
=======================================
  Files           5        5           
  Lines        1415     1415           
  Branches       72       72           
=======================================
  Hits         1015     1015           
  Misses        400      400           

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