Version 3.1.0

• Add Parallel::finish().

Version 3.0.0

• Collect results in the same order closures were added.

Version 2.2.0

• Remove PhantomData making 'a invariant.

Version 2.1.0

• Run one of the closures on the main thread.

Version 2.0.0

• Parallel::run() now collects results.

Version 1.0.1

• Remove unused mut.

Version 1.0.0

• Initial version