Add support for two factor auth

[metcoder95]

It's important to add support for two-factor auth accounts. I noticed about it when I tried to upload a single gist and the app threw me an error. This because my account has two-factor auth. I'll be working on that if you want 👍

[sr6033]

It will be cool. I will suggest to have options for this. Because some don't have 2 factor authentication.

[metcoder95]

The gists lib don't have support for a two-factor account. Because of this, they recommend using the token instead. I'll be implementing in list command and edit command.

[sr6033]

Okay.