PUT banner/avatar image on Discord bot

With discord.js. (also work with GIF avatar)

Why? Because we can do it now.

Important

We can now do this via the developer portal, in the 'Bot' tab. Much simpler, I agree!

How to process

Copy .env.example to .env
Fill the file
Edit if you want app.js if you want change banner and/or avatar
Run with node app.js OR if need sharding to launch, run shard.js.
Tadam!

Todo

If you want to help. This script works but can be mooore optimized.

Show confirmation/error message when the banner/avatar is changed or not
Enables/disables what you want to change