Interpolate prop

[ChristopherHackett]

In d3 you can use interpolate to determine how values between points should be interpolated. Common use cases interpolate range from cases of making the values displayed to user to make sense ... and also to make charts look "prettier".

I see evidence of the interpolate prop scattered around

• https://github.com/react-d3/react-d3-basic/blob/5691fe8002eae79d91cee51f8ebc4bf873841c30/docs/docs_pre/shared/charts/show.md
• https://github.com/react-d3/react-d3-shape/blob/master/src/components/line.jsx#L19

But it does not look like this value is passed down from the the charts in this repo to the line component. Is this intentional or just an accidental omission?