Update Notification.scala
Update Notification.scala

changing Observable(1, 2, 3) to Observable.just(1, 2, 3) in the example
zjrstar/RxScala,ReactiveX/RxScala,zhongdj/RxScala,jbripley/RxScala,jbripley/RxScala,hermanbanken/RxScala,hermanbanken/RxScala,TracyLu/RxScala,joohnnie/RxScala