message: Update error message on missing chainspec hash
diff: @@ -157,7 +157,7 @@ pub enum ConnectionError {
  WrongChainspecHash(Digest),
  /// Peer should have included the chainspec hash in the handshake message,
  /// but didn't.
  - #[error("peer did not include mandatory chainspec hash in the handshake")]
  + #[error("peer did not include chainspec hash in the handshake when it was required")]
  MissingChainspecHash,
  /// Peer did not send any message, or a non-handshake as its first message.
  #[error("peer did not send handshake")]
  