chore(package.json): install dependency walk-sync@^0.1.3
chore(package.json): install dependency walk-sync@^0.1.3

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