Better README benchmark

[chriselrod]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (591b366) 0.00% compared to head (2bbf1bb) 0.00%.
Report is 1 commits behind head on main.

❗ Current head 2bbf1bb differs from pull request most recent head 09e7c80. Consider uploading reports for the commit 09e7c80 to get more accurate results

Additional details and impacted files

@@          Coverage Diff          @@
##            main      #9   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          1       1           
  Lines         43      43           
=====================================
  Misses        43      43           

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