Upgrade the app to newer plugin versions as well as migrate to newer Android conventions. Gradle syncs and app builds.

app/src/main/AndroidManifest.xml

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    package="com.hyperling.apps.games">
+    xmlns:tools="http://schemas.android.com/tools">
 
     <!-- Include required permissions for Google Mobile Ads to run. -->
     <uses-permission android:name="android.permission.INTERNET" />