bump to 3.6.0

CHANGELOG.md

+# 3.6.0
+* APP拉起微信客服功能
+
 ## 3.5.1
 * 自动释放extMsg
 

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: 3.5.1
+version: 3.6.0
 homepage: https://github.com/JarvanMo/fluwx
 
 environment: