add rc version selecting

Author: kazupon

themes/vue/layout/partials/sidebar.ejs

@@ -18,6 +18,7 @@
         例
         <% } %>
         <select class="version-select">
+            <option value="rc">2.0-rc</option>
             <option selected>1.0</option>
             <option>0.12</option>
         </select>

themes/vue/source/js/common.js

@@ -54,7 +54,10 @@
     // version select
     document.querySelector('.version-select').addEventListener('change', function (e) {
       var version = e.target.value
-      if (version.indexOf('1.') !== 0) {
+      if (version.indexOf('rc') === 0) {
+        var section = window.location.pathname.match(/\/(\w+?)\//)[1]
+        window.location.assign('http://rc.vuejs.org/' + section + '/')
+      } else if (version.indexOf('1.') !== 0) {
         version = version.replace('.', '')
         var section = window.location.pathname.match(/\/(\w+?)\//)[1]
         window.location.assign('http://' + version + '-jp.vuejs.org/' + section + '/')