Fix 1.12 invisible sign

Author: connection-lost

src/me/crafter/mc/lockettepro/DependencyProtocolLib.java

@@ -40,6 +40,10 @@ public static void setUpProtocolLib(Plugin plugin){
 			addTileEntityDataListener(plugin);
 			addMapChunkListener(plugin);
 			break;
+		case v1_12_R1:
+			addTileEntityDataListener(plugin);
+			addMapChunkListener(plugin);
+			break;
 		case UNKNOWN:
 		default:
 			addUpdateSignListener(plugin);