README: update for new node/npm versions.
README: update for new node/npm versions.

Also fixes a typo

uzi/reddit-mobile,DogPawHat/reddit-mobile,uzi/reddit-mobile,DogPawHat/reddit-mobile,curioussavage/reddit-mobile,uzi/reddit-mobile,madbook/reddit-mobile,madbook/reddit-mobile,curioussavage/reddit-mobile,madbook/reddit-mobile