bump to 2.3.0

CHANGELOG.md

-## 2.30
+## 2.3.0
 * 适配Flutter 1.20
 * 升级Android的Gradle以及更库的版本
 

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: 2.2.0
+version: 2.3.0
 homepage: https://github.com/JarvanMo/fluwx
 
 environment: