Labels are getting cut-off in the time-series line chart

Hi Team,
when we are rendering a time-series line chart and if the values are too huge then the labels are getting cut off,
I tried with padding and other options but had no luck.
Is there a way to fix this issue?

```
var chart = c3.generate({
data: {

x: 'x',
columns: [
['x', '2013-01-01', '2013-01-02', '2013-01-03', '2013-01-04', '2013-01-05', '2013-01-06', '2013-01-07', '2013-01-08', '2013-01-09', '2013-01-10', '2013-01-11', '2013-01-12'],
['sample', 130, 200, 100, 400, 150, 250, 30, 200, 100, 400, 150, 1234567890]
],
labels:true
},
axis: {
x: {
type: 'timeseries',
tick: {
// this also works for non timeseries data
values: ['2013-01-05', '2013-01-10']
}
}
}
});
```