Removing unneccessary import

Author: lostintangent

android/app/src/main/java/com/microsoft/codepush/react/CodePushDialog.java

@@ -3,7 +3,6 @@
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.DialogInterface;
-import android.support.v4.app.FragmentActivity;
 
 import com.facebook.react.bridge.Callback;
 import com.facebook.react.bridge.ReactApplicationContext;