leave off the version if it is 0
pass listref for AUTHOR; requires EUMM 6.5702, so do not do this unless something else already requires this version
Dist-Zilla-Plugin-MakeMaker-Awesome-0.30

   - use a listref for AUTHOR argument to WriteMakefile(), but only when the
     EUMM version available is already high enough to accomodate it