[Suggestion] Change Bot Permissions for existing servers (explained in the topic)

So, the main idea, is that whenever we (developers) update the permissions needed for our discord bot, when someone with admin permissions opens their discord server, it will display a popup saying that the bot's permissions got updated. It will display which permissions got added and removed, together with two buttons, one to keep the permissions as they are now, and one to update the permissions.

Why?

I am going to use my situation as an example. Right now, my bot is in 270 guilds and it was made before slash commands were added. I want to add slash commands to my bot now, but the bot doesn't have the slash commands permission, and those servers don't have it either. This would enable atleast most of the servers to enable slash commands and make it possible for me to transition to them.