def referrers(self, hash=None, shortUrl=None):
        warnings.warn("/v3/referrers is depricated in favor of "
                      "/v3/link/referrers", DeprecationWarning)
        if not hash and not shortUrl:
            raise BitlyError(500, 'MISSING_ARG_SHORTURL')
        params = dict()
        if hash:
            params['hash'] = hash
        if shortUrl:
            params['shortUrl'] = shortUrl

        data = self._call(self.host, 'v3/referrers', params, self.secret)
        return data['data']['referrers']
given a bitly url or hash, get statistics about the referrers of that
dataset/ETHPy150Open bitly/bitly-api-python/bitly_api/bitly_api.py/Connection.referrers