bump to 4.0.0-pre.1

CHANGELOG.md

+# 4.0.0-pre.1
+* 重构Flutter端，现在需要`Fluwx fluwx = Fluwx();`调用fluwx实例
+* 支持取消回传值的监听
+* 枚举例按照dart语言规范进行了重命名
+* 一些包含`WeChat`的方法删除了`WeChat`
+* 部分类改为sealed class
+* 最低dart版本>=3.1.0-26.0.dev
+
 # 3.13.1
 * 分享到小程序的thumbnail为必填
 

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: 0.0.1
-homepage:
+version: 4.0.0-pre.1
+homepage: https://github.com/OpenFlutter/fluwx
 
 environment:
   sdk: '>=3.1.0-26.0.dev <4.0.0'