@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions
        launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {


        //=====================ADD ESSAS LINHAS====================
        let badge = UIApplication.shared.applicationIconBadgeNumber

        if badge > 0 {
            UIApplication.shared.applicationIconBadgeNumber = 0
        }
        //========================================================


        return true
    }

  ....