message: Add toolstate link
diff: @@ -15,6 +15,8 @@ PRs against [rust-lang-nursery/rust-forge].
  ### Pages
  +* [Toolstate (rls, rustfmt, clippy)](https://rust-lang-nursery.github.io/rust-toolstate/)
  +
  * [Building rustc with x.py](x-py.html).
  * [Release history](releases.html). Links to previous release
  