fix(enums) make enum variants more consistent

closes #1545

exercises/08_enums/enums1.rs

@@ -12,6 +12,7 @@ enum Message {
 fn main() {
     println!("{:?}", Message::Quit);
     println!("{:?}", Message::Echo);
+    println!("{:?}", Message::Resize);
     println!("{:?}", Message::Move);
     println!("{:?}", Message::ChangeColor);
 }