Merge pull request #31 from achmiral/master

FIX: unique key issue on tweet list item

Author: willrstern

5-redux-react/src/js/components/Layout.js

@@ -27,7 +27,7 @@ export default class Layout extends React.Component {
       return <button onClick={this.fetchTweets.bind(this)}>load tweets</button>
     }
 
-    const mappedTweets = tweets.map(tweet => <li>{tweet.text}</li>)
+    const mappedTweets = tweets.map(tweet => <li key={tweet.id}>{tweet.text}</li>)
 
     return <div>
       <h1>{user.name}</h1>