v8.4.0

What's Changed

• [client] Add per-request extra headers by @dirceu in #1
• Update some links + remove funding info by @juharris in #2
• Add CI by @juharris in #3
• Bump to 8.4.0 by @juharris in #4

New Contributors

• @juharris made their first contribution in #1

Full Changelog: v8.3.0...v8.4.0