New command: Rolldice!! 🎲 (Idea: @reidling-- )

Syntax:

`@wasteof_bot rolldice [No. Of faces of dice]` where `No. Of faces` is optional. Can be 1 to 1000000000000000

`wob rolldice [No. Of faces]` in /chat only.

It can be used as a random number picker.