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http://stackoverflow.com/questions/6736189/how-to-add-write-a-review-rate-us-feature-to-my-app
http://www.brianjcoleman.com/tutorial-rate-me-using-uialertview-in-swift/

import StoreKit   
       
            if #available( iOS 10.3,*){
                SKStoreReviewController.requestReview()
            } else {
                let url = URL(string:"itms-apps://itunes.apple.com/app/" + AppConstants.Info.APP_ID);
                if #available(iOS 10.0, *) {
                    UIApplication.shared.open(url, options: [:], completionHandler: nil)
                } else {
                    UIApplication.shared.openURL(url)
                }
            }