Disable default-features for proc-macro-error

[blorbb]

Hi!

Some context: I'm working on trying to remove all syn v1.* dependencies from leptos. I have gotten most of it done, but leptos depends on rstml, which also depends on this crate.

proc-macro-error appears to no longer be maintained (>1y with no updates, not responding to issues). It is still using syn v1, however only for a single trait extension. This dependency on syn 1 can be disabled by removing the default feature syn-error. This feature can't even be used by crates using syn v2, so removing this feature should require no other changes to the code.

Could you disable default features on proc-macro-error to remove the unnecessary syn v1 dependency? This should also be a simple patch release. Change Cargo.toml to proc-macro-error = { version = "1.0", default-features = false }.

Thanks!

[Kyuuhachi]

Sure, no problem. Didn't know that was a thing.