errorderive 0.0.1

Derive macro for `std::error::Error`
Documentation 
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# errorderive

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A failure-like derive macro for the `std::error::Error`.
The source code is mostly copied from [failure_derive](https://github.com/rust-lang-nursery/failure) & [err-derive](https://gitlab.com/torkleyy/err-derive).

## Compare with err-derive

- Support `edition = "2018"`
- Rust version requires >= 1.30.0
- Use `source` keyword instead of `cause`
- Use `call_site` for more debug information