Seperate scopes with space not comma, and use plural version of param name

[objectiveSee]

Per the Uber API, scope should be space separated, not comma separated. Use scope not scopes as well.

From https://developer.uber.com/v1/auth/

Space delimited list of grant scopes you would like to have permission to access on behalf of the user.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}