update readme

Author: hackware1993

README.md

@@ -1436,11 +1436,14 @@ the driving force for me to continue to maintain.
 Thanks to the following netizens for their sponsorship, let's make Flutter better and better
 together.
 
-1. 栢陶 12￥ 2022.05.15
+1. 栢陶 2022.05.15
 
 # Contact
 
 [email protected]
+![official_account.webp](https://github.com/hackware1993/flutter-constraintlayout/blob/master/official_account.webp?raw=true)
+Subscribe to my wechat official account to get the latest news of ConstraintLayout. Follow-up will
+also share some high-quality, unique, and thoughtful Flutter technical articles.
 
 # License
 

README_CN.md

@@ -1399,11 +1399,13 @@ ConstraintLayout 基于约束的布局算法极其强大和灵活，似乎可以
 
 感谢以下网友的赞助，我们一起让 Flutter 越来越好。
 
-1. 栢陶 12￥ 2022.05.15
+1. 栢陶 2022.05.15
 
 # 联系方式
 
 [email protected]
+![official_account.webp](https://github.com/hackware1993/flutter-constraintlayout/blob/master/official_account.webp?raw=true)
+订阅我的公众号以及时获取约束布局的最新动态。后续也会分享一些高质量的、独特的、有思想的 Flutter 技术文章。
 
 # 协议