Dependencies about d3-contour

[Fil]

Yes in that case you would need to add <script src="https://d3js.org/d3-array.v2.min.js"></script>

We should edit the README and replace d3.range by native JS:
Array.from({ length: 19 }, (_, i) => Math.pow(2, i + 2))

[SteveOW]

@Fil

Thanks very much.

It works now when I link in the d3-array.v2.min.js file.

[Fil]

I managed to make a mistake when updating README: 8b837a9