message: [sync]add debug for PeerNewBlock.
diff: @@ -10,7 +10,7 @@ use starcoin_types::{
  };
  use std::cmp::Ordering;
  -#[derive(Message, Clone)]
  +#[derive(Message, Clone, Debug)]
  #[rtype(result = "()")]
  pub struct PeerNewBlock {
  peer_id: PeerId,
  