:calls: `GET /repos/:owner/:repo/branches/:branch/protection/required_signatures <https://developer.github.com/v3/repos/branches>`

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