Changing (evt Event) MarshalJSON to avoid string escaping bug

relay.go

@@ -229,15 +229,7 @@ func (r *Relay) Publish(ctx context.Context, event Event) Status {
 	defer r.okCallbacks.Delete(event.ID)
 
 	// publish event
-	message := []byte("[\"EVENT\",")
-	if m, e := event.MarshalJSON(); e == nil {
-		message = append(message, m...)
-		message = append(message, ']')
-	} else {
-		return status
-	}
-
-	if err := r.Connection.WriteMessage(websocket.TextMessage, message); err != nil {
+	if err := r.Connection.WriteJSON([]interface{}{"EVENT", event}); err != nil {
 		return status
 	}