message: add cmd.
diff: @@ -84,7 +84,9 @@ pub fn add_command(
  .subcommand(chain::GetBlockCommand)
  .subcommand(chain::EpochInfoCommand)
  .subcommand(chain::GetEpochInfoByNumberCommand)
  - .subcommand(chain::TPSCommand),
  + .subcommand(chain::TPSCommand)
  + .subcommand(chain::UnclePathCommand)
  + .subcommand(chain::GetEpochUnclesByNumberCommand),
  )
  .command(
  Command::with_name("dev")
  