Suggestion: Add a new notification setting for pulling RSS feeds

[RoY7x]

I think title is pretty easy to get. Something to be able to pull RSS feeds like from news sites, or other corners of the internet. I think there is already a couple of Discord bots that do it already, however adding it to YAGPDB might just add further support to an already impressive list of things it can do. It was something that came to mind after finding use with the Reddit notifications.