errno-no-std 0.0.3

Cross-platform interface to the `errno` variable.
Documentation 
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# errno-no-std

Cross-platform interface to the `errno` variable.

An improved version of the [`errno`](https://crates.io/crates/errno) crate.

## Examples

```rust
use errno::{Errno, errno, set_errno};

// Get the current value of errno
let e = errno();

// Set the current value of errno
set_errno(e);

// Extract the error code as an i32
let code = e.0;

// Display a human-friendly error message
println!("Error {}: {}", code, e);
```