Fixed publishable failures

Author: bkonyi

packages/android_alarm_manager/android/src/main/java/io/flutter/plugins/androidalarmmanager/BackgroundExecutionContext.java

@@ -7,6 +7,7 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.res.AssetManager;
+import android.content.SharedPreferences;
 import android.util.Log;
 import io.flutter.embedding.engine.FlutterEngine;
 import io.flutter.embedding.engine.dart.DartExecutor;

packages/android_alarm_manager/pubspec.yaml

@@ -11,9 +11,12 @@ dependencies:
 
 flutter:
   plugin:
-    androidPackage: io.flutter.plugins.androidalarmmanager
-    pluginClass: AndroidAlarmManagerPlugin
-    iosPrefix: FLT
+    platforms:
+      android:
+        package: io.flutter.plugins.androidalarmmanager
+        pluginClass: AndroidAlarmManagerPlugin
+      ios:
+        prefix: FLT
 
 environment:
   sdk: ">=2.0.0-dev.28.0 <3.0.0"