Update README.md

README.md

@@ -2,9 +2,9 @@
  A clone of UIImagePickerController, support picking multiple photos、original photo、video, also allow preview photo and video, fitting iOS6789 system.   
  一个支持多选、选原图和视频的图片选择器，同时有预览功能，适配了iOS6789系统。 
  
- ![image](https://github.com/banchichen/TZImagePickerController/blob/master/Screenshots/photoPickerVc.png) 
- ![image](https://github.com/banchichen/TZImagePickerController/blob/master/Screenshots/photoPreviewVc.png) 
- ![image](https://github.com/banchichen/TZImagePickerController/blob/master/Screenshots/videoPlayerVc.png) 
+ ![image](https://github.com/banchichen/TZImagePickerController/blob/master/Screenshots/photoPickerVc.PNG) 
+ ![image](https://github.com/banchichen/TZImagePickerController/blob/master/Screenshots/photoPreviewVc.PNG) 
+ ![image](https://github.com/banchichen/TZImagePickerController/blob/master/Screenshots/videoPlayerVc.PNG) 
 
 ## 一. Installation 安装
 
@@ -23,7 +23,7 @@
     [self presentViewController:imagePickerVc animated:YES completion:nil];
   
 ## 三. Requirements 要求
-   iOS 6 or later. Requires Arc.
+   iOS 6 or later. Requires Arc  
    iOS6及以上系统可使用. ARC环境.
    
    When system version is iOS6 or iOS7,  Using AssetsLibrary.