fix: update-pkger.sh sed error on osX (#541)
fix: update-pkger.sh sed error on osX (#541)

The script depends on GNU-sed, which is not installed on OS X by
default.  This update changes the solution to using a touched file
rather than sed.
knative/func,knative/func,knative/func,knative/func,knative/func,knative/func,knative/func