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]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

❗ 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

@@           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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