v4.0.0

What's Changed

Note - This release has no actual breaking changes since sharedb@3, so if you are not using Node 14 any longer, it's safe to do a drop-in upgrade.

• 💥 Drop Node.js 14 and add Node.js 20 by @alecgibson in #148
• Add support for sharedb@4 by @ericyhwang in #149

Full Changelog: v3.0.1...v4.0.0