rm unsed func and static

example/lib/main.dart

@@ -26,7 +26,7 @@ class _MyAppState extends State<MyApp> {
     String platformVersion;
     // Platform messages may fail, so we use a try/catch PlatformException.
     try {
-      platformVersion = await WechatPlugin.platformVersion;
+//      platformVersion = await WechatPlugin.platformVersion;
     } on PlatformException {
       platformVersion = 'Failed to get platform version.';
     }

lib/wechat_plugin.dart

@@ -32,18 +32,18 @@ class WechatPlugin {
      await _channel.invokeMethod("shareText",model.toMap());
   }
 
-  static Future shareMiniProgram(WeChatShareMiniProgramModel model)async{
+   Future shareMiniProgram(WeChatShareMiniProgramModel model)async{
     return await _channel.invokeMethod("shareMiniProgram",model.toMap());
   }
 
 
-  static Future shareMusic(WeChatShareMusicModel model)async{
+   Future shareMusic(WeChatShareMusicModel model)async{
     return await _channel.invokeMethod("shareMusic",model.toMap());
   }
 
 
 
-  static Future<dynamic> _handler(MethodCall methodCall){
+   Future<dynamic> _handler(MethodCall methodCall){
 
     if("onWeChatResponse" == methodCall.method){
       _responseStreamController.add(methodCall.arguments);