I believe Lavalink is going ahead with their v4 update soon and removing their v2 websocket client requests (well, they were deprecated in v3 and from what I gathered in their Discord the choice was made to remove it entirely in v4).

This means while twilight-lavalink will still be able to listen in on websocket notifications (I believe the current version listens into PlayerUpdate and Stats op codes), it won't actually be able to make any requests as they're all being supplemented with REST API calls instead.

I'm happy to try and help contribute if possible but, this bot being my first major Rust project (well excluding my here and there with Serenity recently) I'm unsure anyone wants to see what I might produce.

For more information you can find it here:
Their current implementation details for version 3.7.5 can be found here.
Their implementation details for 4.0 can be found here.