Update ./module/routes.js (reactjs#165)

Removed unnecessaries imports Router and browserHistory

Author: franxois

lessons/14-whats-next/modules/routes.js

@@ -1,5 +1,5 @@
 import React from 'react'
-import { Router, Route, browserHistory, IndexRoute } from 'react-router'
+import { Route, IndexRoute } from 'react-router'
 import App from './App'
 import About from './About'
 import Repos from './Repos'