App Store FAQ

Is this plugin violates App Store policy? Am I gonna be rejected for using it?

No, it's not. Apple's developer agreement allows you to perform over-the-air updates of web code and it's assets.

But if you explicitly ask user if he want's to update the app - you might be rejected with the following message:

10.6 Details

Your app includes an update button or alerts the user to update the app. 
To avoid user confusion, app version updates must utilize the iOS built-in update mechanism.

If you execute update download and installation on the app startup by showing some splash with the spinner - you should be fine. But if you'll decide to show a dialog with a prompt message "New update is available. Install it?" - according to the Apple this might confuse the user and considered as a bad practice. So, don't show any prompt messages.

Can I get banned?

Sure, if originally your application was a calculator, but after an update it became a music player. But it has nothing to do with the plugin itself, only how you are using it.