bump up minimum EUMM, to ensure that prereqs end up in the right sections in MYMETA.json

e.g.
http://www.cpantesters.org/cpan/report/2ebbd5b3-6c07-1014-88aa-e69e5672a395
Dist-Zilla-Plugin-DynamicPrereqs-0.009

          - bump minimum required version of ExtUtils::MakeMaker, to avoid a
            mess in MYMETA.json during testing