Update build.gradle

Author: nohli

example/android/app/build.gradle

@@ -28,6 +28,8 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 android {
     compileSdkVersion flutter.compileSdkVersion
     ndkVersion flutter.ndkVersion
+    
+    namespace 'dev.fluttercommunity.androidid.example'
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8