message: Add rustup components history to infrastructure list.
diff: @@ -108,4 +108,12 @@ page](https://rust-lang-nursery.github.io/rust-toolstate/). When each PR is
  merged via CI, the status of each tool is recorded in a JSON file and stored
  in the [toolstate repo](https://github.com/rust-lang-nursery/rust-toolstate).
  +## Rustup components history
  +
  +The [rustup components
  +history](https://rust-lang.github.io/rustup-components-history/) tracks the
  +status of every rustup component for every platform over time. See [the
  +repository](https://github.com/rust-lang/rustup-components-history) for more
  +information.
  +
  [crates.io]: https://crates.io/
  