Makefile.PL: added x_IRC tag to CPAN metadata

- Peter Rabbitson posted a blog post about adding the 'x_IRC' meta tag
  so that MetaCPAN will pick up the information and embed it in the
  page for the G:O:I module; http://blogs.perl.org/users/peter_rabbitson/2014/09/encourage-user-participation-via-a-single-line-patch-to-your-dist-metadata.html
Release 0.025