file extension for ios splash changed?

Why change file extension for ios splash from `png` to `jpg`?

```
splashes.forEach(function(splash) {
  if (splash.name.indexOf('android') == 0) {
    crop('resources/splash-android.png', 'resources/splashes/', splash);
  } else {
    crop('resources/splash-ios.jpg', 'resources/splashes/', splash);
  }
});
```