adicionando material banner

coverage/lcov.info

@@ -0,0 +1,220 @@
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+SF:lib\material_banner\material_banner.dart
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+SF:lib\snackbars\asuka_snack_bar.dart
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+SF:lib\widgets\asuka_content_widget.dart
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lib/material_banner/material_banner.dart

@@ -12,7 +12,6 @@ import '../widgets/asuka_content_widget.dart';
 ///For an example on how to use it, please check the [example] folder.
 
 class AsukaMaterialBanner extends MaterialBanner {
-  Timer? _timer;
   final Duration? duration;
 
   /// Inherits and implements the [MaterialBanner] from flutter material package.
@@ -221,9 +220,8 @@ class AsukaMaterialBanner extends MaterialBanner {
   void call() => show();
 
   void show() {
-    _timer?.cancel();
     if (duration != null) {
-      _timer = Timer(duration!, () {
+      Timer(duration!, () {
         Asuka.hideCurrentMaterialBanner();
       });
     }