tokio-duplex 0.1.0

Combine seperate `AsyncRead` and `AsyncWrite` types into a single `AsyncRead + AsyncWrite` type
Documentation 
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This crate provides only a single type ([Duplex](https://docs.rs/tokio-duplex/latest/tokio-duplex/struct.Duplex.html)), which allows combining a `AsyncRead` type and an `AsyncWrite` type into a single `AsyncRead + AsyncWrite` type.