message: Update readme-starterkits.md
diff: Build a bot for the web and embed it in your site or native application.
  +## [Facebook Starter Kit](https://github.com/howdyai/botkit-starter-facebook)
  +
  +Everything you need to build a Facebook Messenger bot
  +
  ## [Slack Starter Kit](https://github.com/howdyai/botkit-starter-slack)
  Everything you need to build a Slack application or custom internal integration
  