Change beta requirement to ULTRA

Plugins/Mineplex.Core/src/mineplex/core/beta/BetaWhitelist.java

@@ -55,7 +55,7 @@ public class BetaWhitelist extends MiniPlugin
 	{
 		Player player = event.getPlayer();
 		Rank rank = _clientManager.Get(player).GetRank(true);
-		if (rank.has(Rank.TITAN) // If this player is Titan+
+		if (rank.has(Rank.ULTRA) // If this player is Ultra+
 			|| _powerPlayClubRepository.getCachedData(player).isSubscribed() // a PPC subscriber,
 		    || EXTRA_PLAYERS.contains(player.getUniqueId())) // or explicitly whitelisted,
 		{