result-either 0.1.2

Result err variant methods, e.g cloned_err
Documentation 
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Result err variant methods, e.g `map_err_or()`

# Examples
```rust
use result_either::ResultExt;
let ok: Result<i32, &str> = Ok(1);
let err: Result<i32, &str> = Err("err");

assert_eq!(ok.map_err_or(0, str::len),  0);
assert_eq!(err.map_err_or(0, str::len), 3);
```