parsing: fixed parsing frames with attributes contained dashes

[cheshirskycode]

Hello!

I'm building a prototype of 0.9.1 amqp server using amq-protocol and found issue with parsing frames with arguments contained dashes. It doesn't affect lapin as the client library.

Example:

#[test]
    fn test_parse_declare_queue_frame() {
        let frame = AMQPFrame::Method(
            1,
            AMQPClass::Queue(queue::AMQPMethod::Declare(queue::Declare {
                queue: "some_queue".into(),
                passive: true,
                durable: true,
                exclusive: true,
                auto_delete: true,
                nowait: true,
                arguments: Default::default(),
            })),
        );

        let mut buffer = vec![0u8; 30];

        assert!(gen_frame(&frame)(buffer.as_mut_slice().into()).is_ok());
        assert_eq!(parse_frame(buffer.as_slice()), Ok((&[][..], frame)));
    }

Output:

assertion `left == right` failed
  left: Ok(([], Method(1, Queue(Declare(Declare { queue: ShortString("some_queue"), passive: true, durable: true, exclusive: true, auto_delete: false, nowait: true, arguments: FieldTable({}) })))))
 right: Ok(([], Method(1, Queue(Declare(Declare { queue: ShortString("some_queue"), passive: true, durable: true, exclusive: true, auto_delete: true, nowait: true, arguments: FieldTable({}) })))))

The source is serialized as auto_delete: true and parsed as auto_delete: false

[Keruspe]

Thanks!
Your project sounds fun btw.
I'll try to issue a release soon