4.0.2

• Significantly optimize construction of the Voronoi diagram.
• Allow traversal over the Delaunay triangulation.
• Add delaunay.inedges; an incoming halfedge index for each point.
• Add delaunay.outedges; an outgoing halfedge index for each point on the hull.
• Change delaunay.hull to a linked list of nodes, as in Delaunator.
• Move voronoi.find to delaunay.find.
• Remove voronoi.edges.
• Remove voronoi.index.