Prevent ConcurrentModException

Signed-off-by: Lixfel <agga-games@gmx.de>

src/de/steamwar/bungeecore/listeners/TablistManager.java

@@ -88,7 +88,7 @@ public class TablistManager extends BasicListener {
         //Calculate server-player-map
         tablist = new TablistGroup(true, "");
         TablistGroup bau = new TablistGroup(false, "Bau");
-        for (ServerInfo server : ProxyServer.getInstance().getServers().values()){
+        for (ServerInfo server : ProxyServer.getInstance().getServersCopy().values()){
             if(server.getPlayers().isEmpty())
                 continue;