Hi, I've just tried to deploy the sample app on Heroku, and I'm getting "No scope available" (https://login.uber.com/oauth/errors?error=no_scope).

Things I did:

1. Clicked the "Deploy to Heroku" button in the readme
2. Added my client token and secret
3. Successfully deployed.
4. Added https://{my-app-name}.herokuapp.com/submit to my app's Redirect URLs and also added https://{your-app-name}.herokuapp.com to my app's Origin URI for good measure.
5. Added FLASK_DEBUG & False to the Heroku config vars (as key and value respectively).

I'm sure I'm missing something here, but whatever it is should probably be clarified in the readme.