Update README.md

README.md

 # TZImagePickerController
- A clone of UIImagePickerController, support picking multiple photos、original photo、video, also allow preview photo and video, fitting iOS6789 system. 
+ 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
 
@@ -23,20 +23,20 @@
     [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.
-   When system version is iOS 8 or later, Using PhotoKit.
-   如果运行在iOS6或7系统上，用的是AssetsLibrary库获取照片资源。
+   When system version is iOS6 or iOS7,  Using AssetsLibrary.  
+   When system version is iOS 8 or later, Using PhotoKit.  
+   如果运行在iOS6或7系统上，用的是AssetsLibrary库获取照片资源。  
    如果运行在iOS8及以上系统上，用的是PhotoKit库获取照片资源。
    
 ## 四. More 更多 
 
-  If you find a bug, please create a issue.
-  Welcome to cearte pull requests.
-  More infomation please view code.
-  如果你发现了bug，请提一个issue。
-  欢迎给我提pull requests。
+  If you find a bug, please create a issue.  
+  Welcome to cearte pull requests.  
+  More infomation please view code.  
+  如果你发现了bug，请提一个issue。  
+  欢迎给我提pull requests。  
   更多信息见代码，也可查看我的博客: [我的博客](http://www.cnblogs.com/tanzhenblog/ "半尺尘 - 博客园")