bump to 4.0.2

CHANGELOG.md

+# 4.0.2
+* 修复冷启动问题
+* iOS端代码清理
+
 # 4.0.1+1
 * 更新iOS引用方式
 

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: 4.0.1+1
+version: 4.0.2
 homepage: https://github.com/OpenFlutter/fluwx
 
 environment: