Misc distribution udpates

Hi, I've introduced some minor fixes:
* added `Changes` file that satisfies [CPAN::Changes::Spec](https://metacpan.org/pod/distribution/CPAN-Changes/lib/CPAN/Changes/Spec.pod). There is a special [online service to check your CPAN uploads](http://changes.cpanhq.org/author/RHESA) for correctness of the changelog
* switched to single `Dist::Zilla` plugin to manage repository meta information. Be sure to add `issues = 1` if you'd like to use GitHub's issue tracker as a default one

This PR is part of my [advent quest](https://questhub.io/realm/perl/quest/547b4202070ccf750d00010e).

Cheers,
Sergey.