fix Changes to comply w/CPAN::Changes::Spec

Hi,

I've reformatted your Changes file according to the spec in `CPAN::Changes::Spec`. This included explicitly specifying release date. I also wrapped some long lines.

Following this format means that various tools can more easily process your distribution automatically.

GitHub mangle up the diff a bit. Here's more [clear diff](https://github.com/sergeyromanov/RDF-NS/commit/da6331628df9482b248b015089361ad896886e8f?w=1).

You can find out more about this at Brian Cassidy's [CPAN::Changes Kwalitee Service](http://changes.cpanhq.org), which is where I saw your module listed :-)

Cheers,
Sergey

PS: I'm doing this because I'm on a quest to help improve CPAN. Read more about the quest at [Questhub](http://questhub.io):

> http://questhub.io/realm/perl/quest/51f0337718ba7d3959000086

If you decide to update [your other dists](http://changes.cpanhq.org/author/VOJ), feel free to log them in comments on the quest -- every dist helps!