aebundler: switch comment from google_appengine to google-appengine (#47)
aebundler: switch comment from google_appengine to google-appengine (#47)

These are equivalent, but GCR would like to encourage users to switch to
the hyphen form.
golang/appengine,golang/appengine,fuchsia-mirror/third_party-github.com-golang-appengine,fuchsia-mirror/third_party-github.com-golang-appengine