change package name

android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.buywhat"
+    package="xyz.mtfos.buywhat"
     android:versionCode="1"
     android:versionName="1.0">
 

android/app/src/main/java/xyz/mtfos/buywhat/MainActivity.java

@@ -1,4 +1,4 @@
-package com.buywhat;
+package xyz.mtfos.buywhat;
 
 import com.facebook.react.ReactActivity;
 

android/app/src/main/java/xyz/mtfos/buywhat/MainApplication.java

@@ -1,4 +1,4 @@
-package com.buywhat;
+package xyz.mtfos.buywhat;
 
 import android.app.Application;