Voice channel mention (#932)

* Voice channel mention

I recently noticed voice channels can be mentioned just like text channels. A small change to the code to implement this feature.

* Voice channel mention

* vc.getName() changed to vc.getAsMention()

src/main/java/com/jagrosh/jmusicbot/utils/FormatUtil.java

@@ -74,7 +74,7 @@ public class FormatUtil {
     {
         String out = " Multiple voice channels found matching \""+query+"\":";
         for(int i=0; i<6 && i<list.size(); i++)
-            out+="\n - "+list.get(i).getName()+" (ID:"+list.get(i).getId()+")";
+            out+="\n - "+list.get(i).getAsMention()+" (ID:"+list.get(i).getId()+")";
         if(list.size()>6)
             out+="\n**And "+(list.size()-6)+" more...**";
         return out;