build!: Update library to use Node 12 (#131)
build!: Update library to use Node 12 (#131)

Co-authored-by: sofisl <db5f31dcffac94c616d6f139fc6a9d43079218ec@users.noreply.github.com>
googleapis/google-cloudevents-nodejs,googleapis/google-cloudevents-nodejs,googleapis/google-cloudevents-nodejs