Method do_echo

tests/test_cmd2.py:3678–3680

(self, args)

        super().__init__(*args, **kwargs)

    def do_echo(self, args) -> None:
        self.poutput(args)
        self.perror(args)

    def do_echo_error(self, args) -> None:
        self.poutput(args, style=Cmd2Style.ERROR)