wrapping 0.2.0

Wrapping slices and arrays
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# wrapping

Wrapping around for slices.

Implements a wrapper around slices that allows for indexing beyond the
length of the slice, by taking the index always modulo the length.

## Example
```rust
use wrapping::Wrapping;

let array: [&str; 1] = ["hello"];
let wrapping = Wrapping::from(&array[..]);

assert_eq!(wrapping[0], "hello");
assert_eq!(wrapping[1], "hello");
```