docs(README): add commonJS bits to example use
docs(README): add commonJS bits to example use

chadhietala/broccoli-persistent-filter,stefanpenner/broccoli-persistent-filter,rwjblue/broccoli-persistent-filter,joliss/cauliflower-filter,stefanpenner/cauliflower-filter,jcope2013/broccoli-persistent-filter,csantero/broccoli-persistent-filter,caitp/cauliflower-filter,chadhietala/cauliflower-filter,joliss/broccoli-filter,matthewjh/cauliflower-filter,broccolijs/broccoli-filter