Check package versions and do not downgrade them

This library sets package versions to hard-coded values in the 1.x series:

https://github.com/emberjs/ember-octanify/blob/master/index.js#L24

However our new app blueprints use 2.x for some things.

This script should check if the version is at least 1.x, and if it is that version or later, make no change.