add api to get protocol version (for version check in the future)

platforms/velocity/src/main/java/us/ajg0702/queue/platforms/velocity/players/VelocityPlayer.java

@@ -131,6 +131,11 @@ public class VelocityPlayer implements AdaptedPlayer, Audience {
         );
     }
 
+    @Override
+    public int getProtocolVersion() {
+        return handle.getProtocolVersion().getProtocol();
+    }
+
     @Override
     public String getName() {
         return handle.getUsername();