Updated missing url https://cdn.rawgit.com/olihawkins/d3-hexjson/master/build/d3-hexjson.js to https://cdn.jsdelivr.net/gh/olihawkins/d3-hexjson/build/d3-hexjson.js
https://d3js.org/d3.v4.min.js
https://cdn.rawgit.com/olihawkins/d3-hexjson/master/build/d3-hexjson.js