handle_disconnect works perfectly for infinite reconnection like in issue 5 - when host got down after some time

but it does not handle connection error in WebSockex.start_link - so if there is no connection to host, application does not start:
21:18:29.799 [info] Application arbi exited: Arbi.Application.start(:normal, []) returned an error: shutdown: failed to start child: Arbi.WsSup ** (EXIT) shutdown: failed to start child: Arbi.WsWorker ** (EXIT) %WebSockex.ConnError{original: :econnrefused}