eliminate background taskground task issue on iOS #661
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When I call
fetchReceipt, I get a warning about not ending a background task (SKReceiptRefreshRequest).Background Task 5 ("SKReceiptRefreshRequest"), was created over 30 seconds ago. In applications running in the background, this creates a risk of termination. Remember to call UIApplication.endBackgroundTask(_:) for your task in a timely manner to avoid this.by canceling
refreshReceiptRequestin thedeinit, the warning is eliminated.