Is 'activesupport' gem really required?

I'm using `i18n-tasks` for my project (Parallels/vagrant-parallels#56) and I've noticed that it brings this dependency chain which I don't need: `activesupport -> minitest`

I could be wrong, but it seems to me that it isn't necessary to extend `I18n::Tasks::Configuration` by `ActiveSupport::Concern`.

I've tried to delete this and it is still working fine. So, do we really need for 'activesupport' gem dependency?