into-owned 0.2.1

Provides a trait for associating a type with its owned variant
Documentation 
# Change log

## v0.2.1 - 2020.5.8
* Fixed implementations of `PartialEq`, `Eq`, `PartialOrd`, `Ord`, and `Hash` for `Is<'a, T>`.

## v0.2.0 - 2020.5.7

### Added
* Added `IntoOwned::is_owned` method. This is a required method.
* Added `IntoOwned::try_as_mut` method. this is a required method.
* Added `IntoOwned::as_is` method and its return type `Is<'a, T>`. `as_is` is a required method.

### Removed 
* Removed `IntoOwned::IS_OWNED`.

### Changed
* Added `Sized` trait bound to `IntoOwned`.

## v0.1.0 - 2020.5.4
* Initial release.