chore: Update FUNDING.yml (#55)

## Summary

<!-- What does this PR do? Why? -->

## Checklist

- [ ] `npm run check` passes locally (tests, lint, typecheck)
- [ ] New behaviour is covered by tests
- [ ] Commit messages follow [Conventional
Commits](https://www.conventionalcommits.org/) (`feat:`, `fix:`,
`docs:`, etc.)

Author: MattDevy

.github/FUNDING.yml

@@ -1 +1 @@
-github: MattDevy # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+github: [MattDevy] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]