Update README.md

Author: lixiang1994

README.md

@@ -378,5 +378,7 @@ If you extended the functionality of AttributedString yourself and want others t
 AttributedString is under MIT license. See the [LICENSE](LICENSE) file for more info.
 
 
-> 欢迎入群交流
+-----
+
+> ## 欢迎入群交流
 ![QQ](https://github.com/lixiang1994/Resources/blob/master/QQClub/QQClub.JPG)