Require Module::CoreList v2.31_01

Hi Yasutaka,

I noticed that you're using Module::CoreList->removed_from(), but removed_from() was only added to Module::CoreList with version 2.31_01: https://metacpan.org/source/BINGOS/Module-CoreList-2.91/Changes.

The commit associated with the pull request fixes the minimum required version for Module::CoreList accordingly. Thank you for considering it!