chore(package): update async to version 1.4.2
chore(package): update async to version 1.4.2

http://greenkeeper.io/
jahglow/r-sort-table,ConfirmitASA/r2integration,kentcdodds/kcd-common-tools,kentcdodds/kcd-common-tools,ConfirmitASA/r2integration,jahglow/r-sort-table