This is based on the code of
"Dist::Zilla::Plugin::Author::KENTNL::Prereqs::Latest::Selective", but
intended for a wider audience.

[Prereqs::MatchInstalled]
module = My::Module

NOTE: Dependencies will only be upgraded to match the *Installed*
version if they're found elsewhere in the dependency tree.

This is designed so that it integrates with other automated version
provisioning.

If you're hard-coding module dependencies instead, you will want to
place this module *after* other modules that declare dependencies.