Dist::Zilla::Role::VersionProvider - something that provides a version number for the dist
Plugins implementing this role must provide a
provide_version method that will be called when setting the dist's version.
If a VersionProvider offers a version but one has already been set,
an exception will be raised.
provides_version returns undef,
it will be ignored.
Ricardo SIGNES <email@example.com>
This software is copyright (c) 2014 by Ricardo SIGNES.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.