func getUpdateStatus(){
           var ref: DatabaseReference!

           ref = Database.database().reference()
           ref.child("checkeriOS").child("updateRequired").observeSingleEvent(of: .value, with: { (snapshot) in
               var requiresUpdate = snapshot.value as? Int
               print(requiresUpdate)

           }) { (error) in
               print("Error connecting to database")
           }
     }