C3-Bar chart Start Label from 0 to the actual value -increasing from 0 and increment to value

Is there any way in C3.js to start data labels start from 0 and increment to the value as the bar renders on the chart.
labels:{format : function (v, id, i, j) { return v; }}
transition: {
duration: 2000
}

Using above piece of code renders chart with data labels start directly from final value .
for example my data1 bar value is 60, bar chart should from 0 ,1,2...60 as the bar loads completely.

Codepn url -http://codepen.io/nagasai/pen/BzLapM

Thanks
Sai