This will be a breaking change in the near future. To make the transition easier, we're allowing you to set admin settings the old way by passing
required_pull_request_reviews on the general update branch protection endpoint until ~April 21, 2017~ May 2, 2017. At that point, the only way to change your admin settings will be to pass
enforce_admins, and passing
include_admins will receive 404 responses.
If you have any questions or feedback, please let us know!