Feature request: anyio

[theunkn0wn1]

Downstream we would like to use an alternative async framework, namely trio .
It appears that capnp.AsyncIoStream 's create_connection and create_unix_connection are proxies to the asyncio methods by the same names.
it would be awesome if this library supported other async frameworks.

[haata]

I'm rather busy right now, so I don't have much planned for development.
But, as long as it mains compatible with existing usages and supported python versions, I would be open to patches for this.