Added Cloudflare adapter to README.md

[isaac-mcfadyen]

Changes

• The README.md is currently missing the @astrojs/cloudflare package.
• This PR adds it (matching the format of the others).

Testing

• No tests were modified, docs change only.

Docs

• Docs (well, README) was updated with @astrojs/cloudflare package and version.

[changeset-bot]

⚠️ No Changeset found

Latest commit: c6da21e

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[natemoo-re]

Thank you! This is great.