Skip the gen_state when use a custom state into the authorized_params config

[fabiosammy]

I'm using a custom state value on oauth2 to define some redirects into my application.

A better way to manage this, is creating a state param with base64 encoded content, to put whatever we want to send custom parameters to the oauth.

In my case, I created a oauth proxy to manage multiple applications using the same API credentials.

[danschultzer]

Thanks! It actually already used the state defined in authorization_params, just didn't return it correctly.

[danschultzer]

v0.1.19 released!