Remove 'version_from' from META.yml

This isn't part of the CPAN::Meta::Spec, and is unnecessary anyway since we now have a 'version' key (added by r1469135 for 2.0.8). This resolves CPAN RT#78184.

git-svn-id: https://svn.apache.org/repos/asf/perl/modperl/trunk@1635427 13f79535-47bb-0310-9956-ffa450edef68