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README.md

@@ -89,4 +89,4 @@ Spring Boot 使用的各种示例，以最简单、最实用为标准
 
 关注公众号：纯洁的微笑，回复"springboot"进群交流
 
-![](http://www.ityouknow.com/assets/images/keeppuresmile.jpg)
+![](http://www.ityouknow.com/assets/images/keeppuresmile_430.jpg)