Upgraded url_launcher

packages/zefyr/CHANGELOG.md

 There is also new `ZefyrField` widget which integrates Zefyr with material design decorations.
 
 * Breaking change: `ZefyrEditor` requires an ancestor `ZefyrScaffold`.
+* Upgraded to `url_launcher` version 4.0.0.
 * Exposed `ZefyrEditor.physics` property to allow customization of `ScrollPhysics`.
-* Added basic `ZefyrField` widget.
+* Added basic `ZefyrField` widget with material design decorations.
 
 ## 0.2.0
 

packages/zefyr/analysis_options.yaml

 analyzer:
   language:
-    enableSuperMixins: true
+#    enableSuperMixins: true
 
 # Lint rules and documentation, see http://dart-lang.github.io/linter/lints
 linter:

packages/zefyr/lib/src/widgets/toolbar.dart

 import 'package:notus/notus.dart';
 
 import 'buttons.dart';
-import 'controller.dart';
 import 'editor.dart';
 import 'theme.dart';
 

packages/zefyr/pubspec.yaml

   flutter:
     sdk: flutter
   collection: ^1.14.6
-  url_launcher: ^3.0.0
+  url_launcher: ^4.0.0
   image_picker: ^0.4.5
   quill_delta: ^1.0.0-dev.1.0
   notus: ^0.1.0