conquer-once 0.4.0

Synchronization primitives for lazy and one-time initialization
Documentation 
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# Releases

## Release `0.2.0`

- fixes internal soundness issues (e.g. one similar to
  https://github.com/rust-lang/rust/pull/65719)
- renames `OnceCell::new` to `OnceCell::uninit` and `OnceCell::initialized` to
  `OnceCell::new`
- adds some convenience trait implementations and tightens some trait bounds
  (breaking)
- improved internal code structure and code re-usage, better facilitates
  monomorphic code usage

### Release `0.2.1`

- updates docs to explicitly specify the concrete synchronization guarantees

## Release `0.3.0`

- mostly internal refactorings
- adds the `noblock` module containing types which only allow non-blocking
  initialization
- `raw` is renamed to `doc` and hidden from documentation, but linked to from
  within the docs
- the `Spin` marker type is no longer exported

### Release `0.3.1`

- fixes an apparent regression, requiring a new compiler than the stated 1.36.0

### Release `0.3.2`

- fixes potential UB due to insufficiently strict bounds on `Sync` implementation for `OnceCell` (see [Issue #3](https://github.com/oliver-giersch/conquer-once/issues/3))

### Release `0.3.3`

- improves and clarifies wording of public documentation
- improves internal documentation around all uses of unsafe code

## Release `0.4.0`

- bumps MSRV to 1.49.0