message: Add nagbot
  I saw things about "nag" in the rust-dashboard repo, but that's not actually where nagbot's code is. I expected to find it listed here; now it will be!
diff: @@ -31,6 +31,10 @@ Documentation on rfcbot commands can be found [in the dashboard repository](http
  Please contact [Adam Perry](https://github.com/dikaiosune) ("dikaiosune" on IRC) if something goes wrong with the bot, or open an issue on [the dashboard repository](https://github.com/dikaiosune/rust-dashboard/).
  +## nagbot
  +
  +[nagbot](https://github.com/aturon/nag-rs) is a bot that emails Rust team members to nag them for reviews. Please contact [Aaron Turon](https://github.com/aturon) ("aturon" on IRC) if something goes wrong with the bot, or open an issue on [its repo](https://github.com/aturon/nag-rs).
  +
  ## Others
  TODO: Describe these better.
  