migrate namespace to app/build.gradle

as recommended by build output

Author: Christopher J. Brody

app/build.gradle

@@ -1,6 +1,8 @@
 apply plugin: 'com.android.application'
 
 android {
+  namespace 'net.zetetic'
+
   compileSdkVersion 30
 
   defaultConfig {

app/src/main/AndroidManifest.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          package="net.zetetic" android:versionCode="1" android:versionName="1.0-SNAPSHOT">
+          android:versionCode="1" android:versionName="1.0-SNAPSHOT">
     <uses-permission android:name="android.permission.INTERNET"/>
     <application android:icon="@drawable/icon"
                  android:debuggable="true"