Incoming and Outgoing does not implement serde::{Serialize, Deserialize}

[shekohex]

Hello! Currently working on a protocol that uses round-based crate v0.2.0, and it does look like that is the latest version does not support serde, any reason behind this?

I would like to be able to send these messages over the wire, or to even save it into the desk using different serde formats.

Could we possibly add this feature to round-based behind serde feature flag? I can open a PR to add support for this!

[shekohex]

See #15