Force landscape image

Hey, I’m a huge huge fan of this plugin, it’s saved me so much hassle!

I was wondering if you knew of a way to modify it to force the user to submit not-portrait photos? I.e. the featured image would have to have width >= height for it to be allowed.

If you have any tips I’d be hugely appreciative!

https://wordpress.org/plugins/force-featured-image/