clean up code

example/lib/main.dart

@@ -2,7 +2,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter_ijkplayer/flutter_ijkplayer.dart';
 import 'package:ijkplayer_example/page/index.dart';
 import 'package:oktoast/oktoast.dart';
-import 'package:flutter_localizations/flutter_localizations.dart';
 
 void main() {
   IjkConfig.isLog = true;

lib/flutter_ijkplayer.dart

@@ -1,5 +1,6 @@
 export 'src/error.dart';
 export 'src/ijkplayer.dart';
 export 'package:flutter_ijkplayer/src/entity/video_info.dart';
-export 'src/widget/controller_widget_builder.dart' show DefaultIJKControllerWidget;
+export 'src/widget/controller_widget_builder.dart'
+    show DefaultIJKControllerWidget;
 export 'package:flutter_ijkplayer/src/helper/config.dart';