Tracking issue for WebSerial support.

[shymega]

I'm working with the PineBuds, and in discussions with a team member, we deliberated whenever we could use this crate with the WebSerial API.

I was thinking of adding a trait impl, guarded by the wasm Rust target so that we could use it that way.

I'm just drafting this issue tonight, but I'm a little sleepy, so I'll re-address it when I'm functional again.

Thanks!

[RossSmyth]

Note that it is not portable and Mozilla has indicated they don't plan on supporting it.
mozilla/standards-positions#336