Change `dynamic` to `@objc`
Change `dynamic` to `@objc`

Thanks @kballard
radex/SwiftyTimer,dnsmob/SwiftyTimer,luzefeng/SwiftyTimer,dnsmob/SwiftyTimer,uny/SwiftyTimer,kostiakoval/SwiftyTimer,kostiakoval/SwiftyTimer,luzefeng/SwiftyTimer,uny/SwiftyTimer,radex/SwiftyTimer