allow building on erlang 18
allow building on erlang 18

kevinmontuori/nitrogen,kevinmontuori/nitrogen,joaohf/nitrogen,nitrogen/nitrogen,joaohf/nitrogen,choptastic/nitrogen,joaohf/nitrogen,stuart-thackray/nitrogen,choptastic/nitrogen,nitrogen/nitrogen,choptastic/nitrogen,nitrogen/nitrogen,stuart-thackray/nitrogen,stuart-thackray/nitrogen,kevinmontuori/nitrogen