1.1.0 has been taken down due to a few issues. 1.1.1 has taken its place and should be more easily usable.
Supports 1.21.x, Fabric API 0.102+. Version 1.1.0 originally added automatic elytra swapping.
Updated the mod to support 1.21.x (which could possibly be backported to 1.20.4-1.20.6)
Fixed issue #1 on GitHub
Released the new mod. This is a replacement to Quick Elytra.