fix(rustup): Extend now takes an IntoIterator
fix(rustup): Extend now takes an IntoIterator

mfeckie/hyper,Ryman/hyper,nickgonzales/hyper,nstoddard/hyper,golddranks/hyper,sfackler/hyper,softprops/hyper,hyperium/hyper,fhahn/hyper,reem/hyper,jmmaranan/hyper,Keats/hyper,fengsp/hyper,TimNN/hyper,yangxingpping/hyper,youprofit/hyper,yazaddaruvala/hyper,Twey/hyper,hannobraun/hyper,nickgonzales/hyper,peterhj/hyper,Twey/hyper,golddranks/hyper,hyperium/hyper,fuchsnj/hyper,mneumann/hyper,mlalic/hyper,tshepang/hyper,hannobraun/hyper,hyperium/hyper,golddranks/hyper,Twey/hyper,markuskobler/hyper,mitsuhiko/hyper,steveklabnik/hyper,mikedilger/hyper,tshepang/hyper,bheesham/hyper,giftcards/hyper,mre/hyper,hannobraun/hyper,markuskobler/hyper,bonifaido/hyper,yazaddaruvala/hyper,markuskobler/hyper,lame-nickname/hyper,rschulman/hyper,nickgonzales/hyper,Keats/hyper,tshepang/hyper,erickt/hyper,nstoddard/hyper,pyfisch/hyper,huonw/hyper,tempbottle/hyper,mlalic/hyper,clatour/hyper,ianks/hyper,manuel-woelker/hyper,Keats/hyper,achanda/hyper