bump to 4.2.7

CHANGELOG.md

+# 4.2.7
+
+* 修复在Flutter module中编译不过的问题
+
 # 4.2.6
 
 * Fix #549

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: 4.2.6
+version: 4.2.7
 homepage: https://github.com/OpenFlutter/fluwx
 
 environment: