Add 'use warnings' (or its equivalents) to all modules, or convince us that your favorite module is well-known enough and people can easily see the modules warn when something bad happens.

Error: YAML::Old::Dumper, YAML::Old::Dumper::Base, YAML::Old::Error, YAML::Old::Loader, YAML::Old::Loader::Base, YAML::Old::Types

Add all modules contained in this distribution to the META.yml field 'provides'. Module::Build or Dist::Zilla::Plugin::MetaProvides do this automatically for you.