Update README.md

[paulflang]

Checklist

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

Additional context

Add any other context about the problem here.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (320ca04) 94.24% compared to head (9fdf009) 0.27%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #137 +/- ## ========================================== - Coverage 94.24% 0.27% -93.98% ========================================== Files 7 7 Lines 365 362 -3 ========================================== - Hits 344 1 -343 - Misses 21 361 +340 ```

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