Move Chat: Gitter -> Discord (#869)

Author: swapagarwal

template/src/components/Hello.vue

@@ -5,7 +5,7 @@
     <ul>
       <li><a href="https://vuejs.org" target="_blank">Core Docs</a></li>
       <li><a href="https://forum.vuejs.org" target="_blank">Forum</a></li>
-      <li><a href="https://gitter.im/vuejs/vue" target="_blank">Gitter Chat</a></li>
+      <li><a href="https://chat.vuejs.org" target="_blank">Community Chat</a></li>
       <li><a href="https://twitter.com/vuejs" target="_blank">Twitter</a></li>
       <br>
       <li><a href="http://vuejs-templates.github.io/webpack/" target="_blank">Docs for This Template</a></li>