Merge pull request #108 from davideddr/patch-1

Fix import statement

Author: vonovak

docs/with-navigation.md

@@ -12,7 +12,7 @@ sidebar_label: withNavigation
 
 ```js
 import React from 'react';
-import { Button } 'react-native';
+import { Button } from 'react-native';
 import { withNavigation } from 'react-navigation';
 
 class MyBackButton extends React.Component {
@@ -24,4 +24,4 @@ class MyBackButton extends React.Component {
 // withNavigation returns a component that wraps MyBackButton and passes in the
 // navigation prop
 export default withNavigation(MyBackButton);
-```
+```