forked from trebor's block: Circles Chartlet
Updated missing url https://rawgit.com/twitter/d3kit/v2.0.0/dist/d3kit.js to https://cdn.jsdelivr.net/gh/twitter/d3kit/v2.0.0/dist/d3kit.js
https://d3js.org/d3.v4.min.js
https://rawgit.com/twitter/d3kit/v2.0.0/dist/d3kit.js