code: def get_required_signatures(self):
          
          headers, data = self._requester.requestJsonAndCheck(
              "GET",
              self.protection_url + "/required_signatures",
              headers={'Accept': Consts.signaturesProtectedBranchesPreview}
          )
          return data["enabled"]
docs: :calls: `GET /repos/:owner/:repo/branches/:branch/protection/required_signatures <https://developer.github.com/v3/repos/branches>`