Merged in changes from beta channel

packages/zefyr/CHANGELOG.md

 * Breaking change: removed `ZefyrEditor.of` and `ZefyrEditableText.of` static methods.
   Use `ZefyrScope.of` instead.
 
+## 0.4.0
+
+* Breaking change: upgraded `image_picker` to `^0.5.0` and `url_launcher` to `^5.0.0` which
+  requires migration to Android X. You must migrate your app in order to use this version.
+  For details on how to migrate see:
+  - https://flutter.io/docs/development/packages-and-plugins/androidx-compatibility
+  - https://developer.android.com/jetpack/androidx/migrate
+
 ## 0.3.1
 
 - Fixed autofocus not being triggered when set to `true` for the first time.

packages/zefyr/example/android/app/build.gradle

 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion 28
 
     lintOptions {
         disable 'InvalidPackage'

packages/zefyr/pubspec.yaml

 name: zefyr
 description: Clean, minimalistic and collaboration-ready rich text editor for Flutter.
-version: 0.3.1
+version: 0.4.0
 author: Anatoly Pulyaevskiy <anatoly.pulyaevskiy@gmail.com>
 homepage: https://github.com/memspace/zefyr
 
   flutter:
     sdk: flutter
   collection: ^1.14.6
-  url_launcher: ^4.0.0
-  image_picker: ^0.4.5
+  url_launcher: ^5.0.0
+  image_picker: ^0.5.0
   quill_delta: ^1.0.0-dev.1.0
   notus: ^0.1.0
   meta: ^1.1.0