added a warning for autotnt place mode

this is temporary until the calculation algorithm is improved

src/main/java/cloudburst/rejects/modules/AutoTNT.java

@@ -41,7 +41,7 @@ public class AutoTNT extends Module {
 
     private final Setting<Boolean> place = sgGeneral.add(new BoolSetting.Builder()
             .name("place")
-            .description("Whether to place tnt.")
+            .description("Whether to place tnt. (VERY LAGGY)")
             .defaultValue(true)
             .build()
     );