Feature Request: Support for embedded-io

Hi, do you have any plan on supporting the [Read](https://github.com/rust-embedded/embedded-hal/blob/dd0bbbaa5c926628ff03dfd78fb54162fec05ab9/embedded-io/src/lib.rs#L304) and [Write](https://github.com/rust-embedded/embedded-hal/blob/dd0bbbaa5c926628ff03dfd78fb54162fec05ab9/embedded-io/src/lib.rs#L379) crates defined in [embedded-io](https://github.com/rust-embedded/embedded-hal/tree/master/embedded-io)?
It would be great to be able to use this library in embedded systems (where `std::io::Read` and `std::io::Write` are not available).

Thank you!

Start by reviewing the linked embedded-io Read and Write traits and the byteorder library's current std::io integration. Determine the compatibility approach needed for embedded systems without std; done means byteorder can be used with those traits in no_std environments.

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