d3-geo and geojson: * Added `@types/geojson` to the npm dependencies in preparation of the d3-geo typings.
d3-geo and geojson:
* Added `@types/geojson` to the npm dependencies in preparation of the d3-geo typings.

tomwanzek/d3-v4-definitelytyped,tomwanzek/d3-v4-definitelytyped