discovery: rename Gossiper graph dep

server.go

@@ -1022,7 +1022,7 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
 	}
 
 	s.authGossiper = discovery.New(discovery.Config{
-		Router:                s.graphBuilder,
+		Graph:                 s.graphBuilder,
 		Notifier:              s.cc.ChainNotifier,
 		ChainHash:             *s.cfg.ActiveNetParams.GenesisHash,
 		Broadcast:             s.BroadcastMessage,