Add Centrifugo

Real-time messaging (Websockets or SockJS) server in Go

README.md

@@ -522,6 +522,7 @@ See [go-hardware](https://github.com/rakyll/go-hardware) for a comprehensive lis
 
 *Libraries that implement messaging systems*
 
+* [Centrifugo](https://github.com/centrifugal/centrifugo) - Real-time messaging (Websockets or SockJS) server in Go.
 * [dbus](https://github.com/godbus/dbus) - Native Go bindings for D-Bus.
 * [emitter](https://github.com/olebedev/emitter) - Emits events using Go way, with wildcard, predicates, cancellation possibilities and many other good wins.
 * [EventBus](https://github.com/asaskevich/EventBus) - The lightweight event bus with async compatibility.