add reference for How to change Status Bar text color

ChenYilong · Mar 2, 2016 · 2cf57f8 · 2cf57f8
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commit 2cf57f8
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diff --git a/README.md b/README.md
@@ -1708,6 +1708,8 @@ bottomlayoutguide 替换成 mas_bottomlayoutguide
  ```
 
 记得要 clean 下或者删除应用程序重新运行
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+参考链接： [**How to change Status Bar text color in iOS 7**]( http://stackoverflow.com/a/17768797/3395008 ) 
 
 #### Demo4---navigationController状态栏样式新的设置方法