Tweaked Changes file and fixed LICENSE in Makefile.PL

Hi,

I've tweaked the formatting of your Changes file, to conform to CPAN::Changes::Spec. This was mainly changing dates to ISO 8601 date format. I also changed the order to most-recent-release first.

Also, the Makefile.PL had LICENSE set to 'Artistic License', but this should be 'artistic' to select the Artistic License, so I corrected that.

Cheers,
Neil