fix small typo (#3986)
fix small typo (#3986)

master version description: from "This all of the current" to "This *is* all of the current"
martinsik/rxjs,ReactiveX/RxJS,trxcllnt/RxJS,benlesh/RxJS,Brocco/RxJS,ReactiveX/RxJS,martinsik/rxjs,ReactiveX/rxjs,kwonoj/RxJS,ReactiveX/RxJS,Brocco/RxJS,kwonoj/RxJS,martinsik/rxjs,trxcllnt/RxJS,Brocco/RxJS,trxcllnt/RxJS,martinsik/rxjs,kwonoj/RxJS,benlesh/RxJS,ReactiveX/rxjs,ReactiveX/rxjs,benlesh/RxJS,trxcllnt/RxJS,ReactiveX/RxJS,ReactiveX/rxjs,benlesh/RxJS,kwonoj/RxJS,Brocco/RxJS