add inShown check to new holograms

stops holograms stacking

api/src/main/java/net/jitse/npclib/internal/NPCBase.java

@@ -88,10 +88,12 @@ public abstract class NPCBase implements NPC, NPCPacketHandler {
                 textDisplayHolograms.remove(targetPlayer.getUniqueId()); // remove the old obj
             }
             
-            Hologram hologram = getPlayerHologram(targetPlayer); //
+            if (isShown(targetPlayer)) { //only show hologram if the player is in range
+                Hologram hologram = getPlayerHologram(targetPlayer);
                 List<Object> updatePackets = hologram.getUpdatePackets(getPlayerLines(targetPlayer));
                 hologram.update(targetPlayer, updatePackets);
             }
+        }
         return this;
     }