[Update] Bug fixes and performance enhancements.

lib/src/openim.dart

@@ -2,7 +2,7 @@ import 'package:flutter/services.dart';
 import 'package:flutter_openim_sdk/flutter_openim_sdk.dart';
 
 class OpenIM {
-  static const version = '3.2.1';
+  static const version = '3.3.0';
 
   static const _channel = const MethodChannel('flutter_openim_sdk');
 

pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_openim_sdk
 description: An instant messaging plug-in that supports Android and IOS. And the server is also all open source.
-version: 3.2.1
+version: 3.3.0
 homepage: https://www.rentsoft.cn
 repository: https://github.com/OpenIMSDK/Open-IM-SDK-Flutter