Reformatted as per CPAN::Changes::Spec

* Changed all dates to ISO 8601 date format
* Separated preamble line from first release
* Got rid of all tab characters, was causing file to look odd in some places
Added [GithubMeta] so github repo will be listed in metadata
Merge pull request #4 from neilbowers/master

Tweaked Changes file and added github repo to metadata