Update README.md

Removing Ryan and Mike as the named maintainers. For one, Mike Selander no longer works for us.

Author: missjwo

README.md

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-			A <strong><a href="https://hmn.md/">Human Made</a></strong> project. Maintained by @rmccue and @mikeselander.
+			A <strong><a href="https://hmn.md/">Human Made</a></strong> project.
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