hwi 0.2.0

Rust wrapper for the Bitcoin Core Hardware Wallet Interface.
Documentation 
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#[derive(Debug)]
pub enum Error {
    JSON(serde_json::error::Error),
    Utf8(std::str::Utf8Error),
    IOError(std::io::Error),
    InvalidOption(String),
    HWIError(String),
    PyErr(String),
}

macro_rules! impl_error {
    ( $from:ty, $to:ident ) => {
        impl std::convert::From<$from> for Error {
            fn from(err: $from) -> Self {
                Error::$to(err)
            }
        }
    };
}

impl_error!(serde_json::Error, JSON);
impl_error!(std::str::Utf8Error, Utf8);
impl_error!(std::io::Error, IOError);

impl std::convert::From<pyo3::prelude::PyErr> for Error {
    fn from(err: pyo3::prelude::PyErr) -> Self {
        Error::PyErr(err.to_string())
    }
}