Is the reason for this crate still valid with const generics? If so, maybe update docs.

This is the motivating example for this crate (slight difference between README and docs):
```
struct Foo<T, N> {
    data: [T; N]
}
```

Could this not be written (in recent Rust versions) as:
```
struct Foo<T, const N: usize> {
    data: [T; N]
}
```

If not, maybe update the motivating example?