How to get started with routing in React apps with React Router
react-router@3.x→4.x】動かない。。アップデートで困っている人が読む記事(how to update react-router3.x vs 4.x) | 武骨日記
Dan on Twitter: "@joseph_carney react-router *examples* are in ES6 but the *library itself* is compiled to ES5 as a build step. What you get from npm is ES5." / Twitter