deprecation

[Fil]

add deprecation notice link to d3@4 which is the last version including d3-queue the byte size of d3-queue@2 is not relevant anymore

[mbostock]

I think I would say:

“Now that D3 uses Promises rather than callbacks (see d3-fetch), this library is no longer needed. Use Promise.all instead, or p-queue if you need configurable concurrency.”

Let’s archive this repo after publishing the last patch release, too.