update Scala TODO list
update Scala TODO list

samuelgruetter/RxScala,ReactiveX/RxScala,TracyLu/RxScala,hermanbanken/RxScala,jbripley/RxScala,samuelgruetter/RxScala,hermanbanken/RxScala,jbripley/RxScala,zjrstar/RxScala,joohnnie/RxScala,zhongdj/RxScala