getGroupBanList(groupId, callback) {
		return StdLib.Promises.timeoutCallbackPromise(10000, null, callback, false, (resolve, reject) => {
			this.user._sendUnified('ChatRoom.GetBanList#1', {
				chat_group_id: groupId
			}, (body, hdr) => {
				let err = Helpers.eresultError(hdr.proto);
				if (err) {
					return reject(err);
				}

				preProcessObject(body);
				resolve(body);
			});
		});
	}
Get the ban list for a chat room group, provided you have the appropriate permissions.
@param {int|string} groupId
@param {function} [callback]
@returns {Promise<{bans: {steamid: SteamID, steamid_actor: SteamID, time_banned: Date, ban_reason: string}[]}>}