Update required option for `protect_branch` method
Update required option for `protect_branch` method

https://developer.github.com/enterprise/2.11/v3/repos/branches/#update-branch-protection
benbalter/octokit.rb,octokit/octokit.rb,JuanitoFatas/octokit.rb,octokit/octokit.rb,JuanitoFatas/octokit.rb,pvdb/octokit.rb,benbalter/octokit.rb,pvdb/octokit.rb