[flutter_plugin_android_lifecycle] remove placeholder dart file (#4413)

Author: balvinderz

packages/flutter_plugin_android_lifecycle/CHANGELOG.md

@@ -1,6 +1,7 @@
-## NEXT
+## 2.0.4
 
 * Updated Android lint settings.
+* Remove placeholder Dart file.
 
 ## 2.0.3
 

packages/flutter_plugin_android_lifecycle/lib/flutter_plugin_android_lifecycle.dart

@@ -2,7 +2,7 @@ name: flutter_plugin_android_lifecycle
 description: Flutter plugin for accessing an Android Lifecycle within other plugins.
 repository: https://github.com/flutter/plugins/tree/master/packages/flutter_plugin_android_lifecycle
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+flutter_plugin_android_lifecycle%22
-version: 2.0.3
+version: 2.0.4
 
 environment:
  sdk: ">=2.12.0 <3.0.0"