message: isRemoteJoinedToRoom should be synchronous
diff: @@ -43,13 +43,13 @@ function MemberListSyncer(ircBridge, appServiceBot, server, appServiceUserId, in
  this._leaveQueuePool = new QueuePool(3, this._leaveUsersInRoom.bind(this));
  }
  -MemberListSyncer.prototype.isRemoteJoinedToRoom = Promise.coroutine(function*(roomId, userId) {
  +MemberListSyncer.prototype.isRemoteJoinedToRoom = function (roomId, userId) {
  const room = this._memberLists.matrix[roomId];
  if (room !== undefined) {
  return room.remoteJoinedUsers.includes(userId);
  }
  return false;
  -});
  +};
  MemberListSyncer.prototype.sync = Promise.coroutine(function*() {
  let server = this.server;
  