Add 2.0-rc option in the select (#399)

Author: posva

themes/vue/layout/partials/sidebar.ejs

@@ -12,6 +12,7 @@
         <h2>
             <%- type === 'api' ? 'API' : (type.charAt(0).toUpperCase() + type.slice(1)) %>
             <select class="version-select">
+                <option value="rc">2.0-rc</option>
                 <option selected>1.0</option>
                 <option>0.12</option>
                 <option>0.11</option>