How to force y axis to inlcude the 0 mark

Hi can I force a go.Scatter chart to always include the 0 mark in the y axis. If I plot a series [50,60,58,55,43,56] it would scale the axis to a range around 35 to 70. I would like the y range to auto scale, but to include the 0 mark, so in this example it should range from 0 to around 70.