[Feature Request] Support Branch protection for setting `required_approving_review_count`

[majormoses]

Per the rest api docs you can send required_approving_review_count as part of the required_pull_request_reviews object with an integer between 1-6 which represents the number of people required to approve the request in larger teams it is not uncommon to want more than a single approval before merging.

[victoryNap]

I started the work on this but got side tracked. Will finish it up.

#880

[gmlewis]

Fixed by #880.
Closing.