bump to 3.8.4

CHANGELOG.md

-# 3.8.3
-* Merge #475
+# 3.8.4
+* 增加微信的日志开关
 
 # 3.8.2+1
 * 升级kotlin-coroutine

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: 3.8.3
+version: 3.8.4
 homepage: https://github.com/JarvanMo/fluwx
 
 environment: