bump to 4.4.0

CHANGELOG.md

+# 4.4.0
+* universal_link 不再是必选项
+
 # 4.3.2
 * iOS新增ignore_security选项，详见#576
 

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: 4.3.2
+version: 4.4.0
 homepage: https://github.com/OpenFlutter/fluwx
 
 environment: