message: Simplify the pattern match.
diff: @@ -73,9 +73,8 @@ impl HighwayMessage {
  let create_msg = |hwm: HighwayMessage| Message::new(creator, hwm);
  match self {
  - Timer(_) => TargetedMessage::new(create_msg(self), Target::SingleValidator(creator)),
  NewVertex(_) => TargetedMessage::new(create_msg(self), Target::AllExcept(creator)),
  - RequestBlock(_) => {
  + Timer(_) | RequestBlock(_) => {
  TargetedMessage::new(create_msg(self), Target::SingleValidator(creator))
  }
  }
  