fixed deps for Flutter Channel Stable

Author: Yom3n

packages/zefyr/example/pubspec.yaml

@@ -20,9 +20,9 @@ dependencies:
   zefyr:
     path: ../
 
-dependency_overrides:
-  notus:
-    path: ../../notus
+#dependency_overrides:
+#  notus:
+#    path: ../../notus
 
 dev_dependencies:
   flutter_test:

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

@@ -259,7 +259,7 @@ class ZefyrToolbarState extends State<ZefyrToolbar>
       buildButton(context, ZefyrToolbarAction.quote),
       buildButton(context, ZefyrToolbarAction.code),
       buildButton(context, ZefyrToolbarAction.horizontalRule),
-      if (editor.imageDelegate != null) ImageButton(),
+      editor.imageDelegate != null ? ImageButton() : Container(),
     ];
     return buttons;
   }

packages/zefyr/pubspec.yaml

@@ -5,15 +5,15 @@ author: Anatoly Pulyaevskiy <anatoly.pulyaevskiy@gmail.com>
 homepage: https://github.com/memspace/zefyr
 
 environment:
-  sdk: '>=2.2.2 <3.0.0'
+  sdk: '>=2.1.0 <3.0.0'
 
 dependencies:
   flutter:
     sdk: flutter
   collection: ^1.14.6
   url_launcher: ^5.0.0
   quill_delta: ^1.0.0-dev.1.0
-  notus: ^0.1.0
+  notus: ^0.1.4
   meta: ^1.1.0
   quiver_hashcode: ^2.0.0