integral-enum 1.0.0

Derive macro for integral enum definition
Documentation 
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# Integral enum
Rust derive-macro that simplifies integral enum creation

# Example

```rust
use integral_enum::IntegralEnum;

/// Simple meaningful enum
/// (!) repr attribute is required
/// and can contain only integral values
/// like u8, u16, u32, u64, u128 and its signed equivalent
#[derive(IntegralEnum)]
#[repr(u8)]
pub enum Emotion {
    // Explicit discriminant is required
    Pain = 0,
    Hatred = 1,
}

// Test it
assert_eq!(Emotion::try_from(0), Ok(Emotion::Pain));
assert_eq!(Emotion::try_from(1), Ok(Emotion::Hatred));
assert_eq!(Emotion::try_from(123), Err(()));
```

Macro will automatically generate the following trait implementations: `TryFrom, Clone, Copy, PartialEq, Eq, Display, Debug`

# TODO

- Do we really need to implement `PartialOrd + Ord` also?