added readInv()

src/main/java/org/bitbiome/commands/InventoryCommand.java

@@ -9,4 +9,7 @@ public class InventoryCommand implements CommandAPI{
     public void performCommand(Scanner scanner, boolean isRunning, String message, TravelEngine travelEngine) {
         
     }
+    public String readInv(TravelEngine travelEngine){
+        return "";
+    }
 }