[Android] Go back to minSdkVersion 16

android/app/src/main/AndroidManifest.xml

     <uses-feature android:name="android.hardware.camera.autofocus"/>
 
     <uses-sdk
-        android:minSdkVersion="19"
+        android:minSdkVersion="16"
         android:targetSdkVersion="23" />
 
     <application