no need to use octet representation for _
non-ascii module names are only usable under Dist::Zilla 5

e.g.
http://www.cpantesters.org/cpan/report/f930d285-6c19-1014-93a5-53805d567b63
Dist-Zilla-Plugin-AuthorityFromModule-0.004

          - allow tests to pass under older Dist::Zilla by skipping testing
            non-ascii module names there