update README.md.

README.md

@@ -1,4 +1,7 @@
-![输入图片说明](https://images.gitee.com/uploads/images/2020/1029/122041_2a0c5bda_1491977.png "屏幕截图.png")
+
+<p align="center">
+    <img src="https://images.gitee.com/uploads/images/2020/1029/122041_2a0c5bda_1491977.png" />
+</p>
 <p align="center">
     <img src="https://images.gitee.com/uploads/images/2018/1214/151026_2299df23_892944.gif" />
 </p>