Add drush command for converting image field to media

So I do like the idea for sure. But since it's been inactive for 2+ years going to make the assumption that maybe it wasn't needed? Module is relatively feature complete, I'm just helping with maintenance. So going to close but if someone stumbled upon this and feels they really need I'll happily do a review.

Thanks!

Since the release 3.0.1 it's possible to convert Image fields to Media using update hooks. So, as a workaround, you can implement hook_post_update_N() and run it with the following Drush command: drush upd
For more information and an example, see the module's home page.