Octokit protect_branch function missing pull request review functionality

[charlottestjohn]

The Repositories protect_branch function supports the following parameters and options:

Parameters:
repo (Integer, String, Hash, Repository) — A GitHub repository.
branch (String) — Branch name
options (Hash) (defaults to: {}) — a customizable set of options

Options Hash (options):
:required_status_checks (Hash) — If not null, the following keys are required:
:include_admins [boolean] Enforce required status checks for repository administrators.
:strict [boolean] Require branches to be up to date before merging.
:contexts [Array] The list of status checks to require in order to merge into this branch
:restrictions (Hash) — If not null, the following keys are required: :users [Array] The list of user logins with push access
:teams [Array] The list of team slugs with push access.
Teams and users restrictions are only available for organization-owned repositories.

The actual branches api which that api mimics, supports more. Here is their listed example of available parameters:

{
  "required_status_checks": {
    "strict": true,
    "contexts": [
      "continuous-integration/travis-ci"
    ]
  },
  "required_pull_request_reviews": {
    "dismissal_restrictions": {
      "users": [
        "octocat"
      ],
      "teams": [
        "justice-league"
      ]
    },
    "dismiss_stale_reviews": true,
    "require_code_owner_reviews": true
  },
  "enforce_admins": true,
  "restrictions": {
    "users": [
      "octocat"
    ],
    "teams": [
      "justice-league"
    ]
  }
}

Currently, the entire "required_pull_request_reviews" section is missing from octokit.

[tarebyte]

@charlottestjohn this seems like a documentation fix to me, would you mind opening a PR to make these changes?

Thanks!

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