integral-enum 1.2.1

# Integral enum
Rust derive-macro that simplifies integral enum creation

# Example

```rust
use integral_enum::IntegralEnum;

/// Simple meaningful enum
/// (!) repr attribute defaults to u8, to specify custom repr 
/// use built-in attribute #[repr(integral_value)] it
/// can contain only integral values
/// like u8, u16, u32, u64, u128 and its signed equivalents.
/// 
/// WARNING: if no explicit #[repr(...)] specified u8 will be used
/// as the underlying integral type, actual enum still can have u16 representation,
/// for example. For most cases this is enough, but if your enum is large
/// enough - specify explicit representation.
/// FIXME: Add automatic representation determining
#[derive(IntegralEnum)]
pub enum Emotion {
    Pain,
    Hatred,
}

// 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`

if you want to disable certain implementation, consider the `#[enum_disable(...)]` attribute,
items can be: `clone`, `copy`, `display`, `debug`, `total_eq`, `partial_eq`, `try_from`

- Some of these attributes are dependant, for example `Copy` depends on `Clone`, so if you disable
`Clone` generation, `Copy` generation will be disabled also.
- `total_eq` disables `Eq` trait implementation

Example:

```rust compile_fail
use integral_enum::IntegralEnum;

#[derive(IntegralEnum)]
#[enum_disable(display)]
pub enum Emotion {
    Pain,
    Hatred,
}

println!("{}", Emotion::Pain); // Compile error
```

# TODO

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