Hello,
First of all, thanks for the library.

It is very good, and I'm currently experimenting the creation of a language server based on it (and your puccini-language-server as a reference) 🙏

The spec just got upgraded a few days ago to 3.17.0 (05/10/2022), we should upgrade the protocol accordingly (if it's not too much effort).

I'm ready to help, still working around your code atm, but totally available 😇