message: remove references to gitter; use chat.vuejs.org for discourse
diff: <a href="https://www.npmjs.com/package/vue"><img src="https://img.shields.io/npm/dm/vue.svg" alt="Downloads"></a>
  <a href="https://www.npmjs.com/package/vue"><img src="https://img.shields.io/npm/v/vue.svg" alt="Version"></a>
  <a href="https://www.npmjs.com/package/vue"><img src="https://img.shields.io/npm/l/vue.svg" alt="License"></a>
  - <a href="https://gitter.im/vuejs/vue"><img src="https://img.shields.io/gitter/room/nwjs/nw.js.svg" alt="Gitter">
  - <a href="https://discordapp.com/invite/eKWPvZ9"><img src="https://img.shields.io/badge/chat-on%20discord-7289da.svg" alt="Discord">
  + <a href="https://chat.vuejs.org/"><img src="https://img.shields.io/badge/chat-on%20discord-7289da.svg" alt="Chat">
  <br>
  <a href="https://saucelabs.com/u/vuejs"><img src="https://saucelabs.com/browser-matrix/vuejs.svg" alt="Sauce Test Status"></a>
  </p>
  @@ -98,7 +97,7 @@ To check out live examples and docs, visit [vuejs.org](https://vuejs.org).
  ## Questions
  -For questions and support please use the [Discord chat room](https://vue-land.js.org/), [Gitter chat room](https://gitter.im/vuejs/vue), or [the official forum](http://forum.vuejs.org). The issue list of this repo is **exclusively** for bug reports and feature requests.
  +For questions and support please use the [the official forum](http://forum.vuejs.org) or [community chat](https://chat.vuejs.org/). The issue list of this repo is **exclusively** for bug reports and feature requests.
  ## Issues
  