fix: Fix broken link

Author: dorayakikun

README.md

@@ -5,4 +5,4 @@ This crate is maintained by the Rust compiler team and in particular by the
 [self-profile working group][wg-self-profile]. It is currently only meant to
 be used within rustc itself, so APIs may change at any moment.
 
-[wg-self-profile]: https://github.com/rust-lang/compiler-team/blob/master/working-groups/self-profile/README.md
+[wg-self-profile]: https://rust-lang.github.io/compiler-team/working-groups/self-profile/