Version 0.5.4

Examples with unstable features need to be marked no_build on stable

Use the state machine from Lazy in OnceCell

Make Step usable outside LazyFuture

Example futures do not need to be Sync

Version 0.5.3

Add examples of Lazy in static context

Merge the QINIT_BIT and READY_BIT atomic operations into one

Add Lazy::replace_and_take

Version 0.5.2

impl `Sync` for `Lazy` when `F` is merely `Send`

Add Lazy::into_parts

Add IntoFuture impls for Lazy

Version 0.5.1

Correctly handle panics when updating the Lazy union