chore(package.json): remove override to install script
chore(package.json): remove override to install script

relates to #1580
benlesh/RxJS,gluck/RxJS,kwonoj/RxJS,ReactiveX/rxjs,martinsik/rxjs,kwonoj/RxJS,robwormald/RxJS,martinsik/rxjs,adrianomelo/RxJSNext,martinsik/rxjs,jayphelps/rxjs,jayphelps/rxjs,RxJS-CN/RxJS-Docs-CN,RxJS-CN/RxJS-Docs-CN,figueredo/RxJS,adrianomelo/RxJS-1,gluck/RxJS,staltz/RxJSNext,Igorbek/rxjs5,elliotschi/rxjs,elliotschi/rxjs,RxJS-CN/RxJS-Docs-CN,ReactiveX/rxjs,kwonoj/RxJS,trxcllnt/RxJS,figueredo/RxJS,gluck/RxJS,staltz/RxJSNext,saneyuki/RxJS,jayphelps/rxjs,adrianomelo/RxJS-1,figueredo/RxJS,adrianomelo/RxJSNext,ReactiveX/RxJS,ReactiveX/RxJS,Brocco/RxJS,jayphelps/rxjs,saneyuki/RxJS,trxcllnt/RxJS,IgorMinar/RxJS,SangKa/RxJS-Docs-CN,elliotschi/rxjs,SangKa/RxJS-Docs-CN,SangKa/RxJS-Docs-CN,benlesh/RxJS,robwormald/RxJS,adrianomelo/RxJSNext,Igorbek/rxjs5,ReactiveX/RxJS,staltz/RxJSNext,adrianomelo/RxJS-1,robwormald/RxJS,robwormald/RxJS,figueredo/RxJS,martinsik/rxjs,gluck/RxJS,Igorbek/rxjs5,trxcllnt/RxJS,elliotschi/rxjs,adrianomelo/RxJSNext,trxcllnt/RxJS,ReactiveX/RxJS,ReactiveX/rxjs,benlesh/RxJS,Brocco/RxJS,ReactiveX/rxjs,adrianomelo/RxJS-1,IgorMinar/RxJS,RxJS-CN/RxJS-Docs-CN,Brocco/RxJS,staltz/RxJSNext,jayphelps/rxjs,kwonoj/RxJS,benlesh/RxJS,SangKa/RxJS-Docs-CN,Brocco/RxJS,Igorbek/rxjs5