Add type declarations for version 4.3.0 about d3-v4-definitelytyped

[tomwanzek]

I am aware of the changes, the definitions in this repo have been migrated to DefinitelyTyped (types-2.0 branch). There you will find the latest available definitions, which are also the ones published to npm @types. All issues, enhancements related to the definitions in this repo are now managed on DT.

I have already updated the definitions for d3-voronoi to version 1.1.0 and published them.

I have opened an issue for d3-geo 1.3.1 DT 12296.

Should you want to expedite the process of updating the d3-geo definitions, feel free to submit a PR against the DefinitelyTyped types-2.0 branch. Please, ensure to @-mention the primary author and myself so we can review/approve,, although I think there might be a bot doing it automagically now.

Otherwise, I will see what I can do at the earliest opportunity to expedite.

Updating the definitions for d3 to version 4.3 is a simple chore,I can quickly do once d3-geo is in.