remove updated import per chtefi PR

Author: ksliu25

lessons/06-params.md

@@ -45,8 +45,6 @@ Now open up `index.js` and add the new route.
 // ...
 // import Repo
 import Repo from './modules/Repo'
-// update imports
-import { Router, Route, hashHistory, IndexRoute, Home } from 'react-router'
 
 render((
   <Router history={hashHistory}>