add note about renders / beta

views/index.jade

@@ -75,6 +75,7 @@ block content
           h3 3D Renders
         p
           | Crafatar also provides support for 3D renders of Minecraft skins.<br>
+          | Please note that <b>this feature is currently beta</b>!<br>
           | Replace 
           mark.green id 
           | with a Mojang <b>UUID</b> or <b>username</b> to get a render of the skin.