Update README.md

Author: geekxh

清晰版电子书1000本/README.md

@@ -9,7 +9,7 @@
 提取码：请下方扫码回复【book】进行获取
 
 <p align="center">
- [![图片展示失败，点击查看](https://www.geekxh.com/code.png)](https://www.geekxh.com/code.png)
+  ![图片展示失败，点击查看](https://www.geekxh.com/code.png)](https://www.geekxh.com/code.png)
 </p>
 
 ![](./book_1000.png)