Reformat change log as per CPAN::Changes::Spec

Hi,

I've reformatted your Changes file according to the spec in [CPAN::Changes::Spec](https://metacpan.org/module/CPAN::Changes::Spec).

Following this format means that various tools can more easily process your distribution automatically.

You can find out more about this at Brian Cassidy's [CPAN::Changes Kwalitee Service](http://changes.cpanhq.org).

Cheers,
Sergey