bump to 3.8.1+1

CHANGELOG.md

+# 3.8.1+1
+* Just update docs
+
 # 3.8.1
 * 在iOS中增加FluwxDelegate
 * 尝试修复iOS冷启动获取extMsg问题

pubspec.yaml

 name: fluwx
 description: The capability of implementing WeChat SDKs in Flutter. With Fluwx, developers can use WeChatSDK easily, such as sharing, payment, lanuch mini program and etc.
-version: 3.8.1
+version: 3.8.1+1
 homepage: https://github.com/JarvanMo/fluwx
 
 environment: