Allow ordered lists to work from 0

Due to the markdown implementation in use by Discord today only allowing you to start from 1., it can cause Discord to change the meaning of a message if you start writing "0. Lorem ipsum"

For example if you type:

0. Lorem ipsum

You will end up with:

1. Lorem ipsum

This completely changes the meaning of the message, making it so you can't start a sentence with 0 and a dot. Either ordered lists shouldn't work unless you start with the number 1, or it should start the ordered list at the first number (in this case: 0).

This can be circumvented by escaping the dot, but I still don't think Discord should change the meaning of the message when you use 0 as the first number.

Github supports starting numbered lists from 0, so Discord should do so too.