feat: add error message for invalid style

src/builtins/blahaj.rs

@@ -36,7 +36,7 @@ impl Builtin for Blahaj {
                 pride_flag(blahaj);
             }else if args[0].eq("-ger"){
                 german(blahaj);
-            }
+            }else {println!("{} is not a valid style for blahaj",args[0])}
         }
         Ok(())
     }