bump to 5.5.1

CHANGELOG.md

-#5.5.0
+# 5.5.1
+* 鸿蒙端bug修复，详见[PR](https://github.com/OpenFlutter/fluwx/pull/700)
+
+# 5.5.0
 * 更新鸿蒙sdk，支持openBusinessView,onWXLaunchFromWX
-* 
+
 # 5.4.2
 * 更新一下API文档
 

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: 5.5.0
+version: 5.5.1
 homepage: https://github.com/OpenFlutter/fluwx
 
 environment: