feat: check for changed files not only in root folder

[schuer]

Just a tiny change, but it could help the 🤖 to provide its helpful comments even if the changesets aren’t located within the root folder.

ref #60

[vercel]

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Name	Status	Preview	Comments	Updated
changesets-bot	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 8, 2023 at 5:31PM (UTC)

[changesets-test-bot]

⚠️ No Changeset found

Latest commit: 5f9b3e5

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[JReinhold]

Until this is merged in, is there a known workaround to this?

@emmatown