async leaveGroup({ groupId, memberId }) {
    const leaveGroup = this.lookupRequest(apiKeys.LeaveGroup, requests.LeaveGroup)
    return await this[PRIVATE.SEND_REQUEST](leaveGroup({ groupId, memberId }))
  }
@public
@param {object} request
@param {string} request.groupId
@param {string} request.memberId
@returns {Promise}