Update changelog with new validation changes (and attributions)
Update changelog with new validation changes (and attributions)

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