Merge branch 'dev'

CHANGELOG.md

+## 3.3.1
+* Fix #354
+
 ## 3.3.0
 * Null-safety support
 * Fix #350

lib/src/response/wechat_response.dart

@@ -46,7 +46,7 @@ Map<String, _WeChatResponseInvoker> _nameAndResponseMapper = {
 
 class BaseWeChatResponse {
   final int errCode;
-  final String errStr;
+  final String? errStr;
 
   bool get isSuccessful => errCode == 0;
 

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: 3.3.0
+version: 3.3.1
 homepage: https://github.com/JarvanMo/fluwx
 
 environment: