add @schlafly to codeowners

[zacharyburnett]

This PR adds @schlafly as a codeowner to review Roman-related PRs

Checklist

• [ ] added entry in CHANGES.rst (either in Bug Fixes or Changes to API)
• [ ] updated relevant tests
• [ ] updated relevant documentation
• [ ] updated relevant milestone(s)
• [ ] added relevant label(s)

[codecov[bot]]

Codecov Report

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

Comparison is base (4a809eb) 82.76% compared to head (dc84cb8) 82.76%. Report is 178 commits behind head on main.

:exclamation: Current head dc84cb8 differs from pull request most recent head 1dd9c63. Consider uploading reports for the commit 1dd9c63 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #224 +/- ## ======================================= Coverage 82.76% 82.76% ======================================= Files 33 33 Lines 5952 5952 ======================================= Hits 4926 4926 Misses 1026 1026 ```

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