chore(package): update istanbul to version 0.4.0
chore(package): update istanbul to version 0.4.0

http://greenkeeper.io/
lalitkapoor/request,simov/request,czardoz/request,simov/request,lxe/request,chaoliu/request,watson/request,czardoz/request,lxe/request,request/request,Aloomaio/request,request/request,watson/request,Aloomaio/request,lalitkapoor/request,chaoliu/request,NewGyu/request,NewGyu/request