bump to 4.2.6

CHANGELOG.md

+# 4.2.6
+
+* Fix #549
+
 # 4.2.5
 
 * iOS支持解析包含Anchors & Alias的Yaml

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: 4.2.5
+version: 4.2.6
 homepage: https://github.com/OpenFlutter/fluwx
 
 environment: