     func sirenUserDidCancel() {}
     func sirenDidFailVersionCheck(error: NSError) {}
     func sirenDidDetectNewVersionWithoutAlert(message: String) {}
+    func sirenLatestVersionInstalled() {}
 
 }
 

            if isAppStoreVersionNewer() {
                showAlertIfCurrentAppStoreVersionNotSkipped()
            } else {
                postError(.noUpdateAvailable, underlyingError: nil)
            }
           

    func sirenUserDidCancel()                                  // User did click on button that cancels update dialog
    func sirenDidFailVersionCheck(error: NSError)              // Siren failed to perform version check (may return system-level error)
    func sirenDidDetectNewVersionWithoutAlert(message: String) // Siren performed version check and did not display alert
    func sirenLatestVersionInstalled()                         // Siren performed version check and latest version is installed
}


