bump to 5.0.2

CHANGELOG.md

+# 5.0.2
+* 删除subscribeResponse, unsubscribeResponse
+
 # 5.0.1
 * Fix #642
 

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: 5.0.1
+version: 5.0.2
 homepage: https://github.com/OpenFlutter/fluwx
 
 environment: