Added preference_changed web socket event

model/message.go

@@ -9,14 +9,15 @@ import (
 )
 
 const (
-	ACTION_TYPING         = "typing"
-	ACTION_POSTED         = "posted"
-	ACTION_POST_EDITED    = "post_edited"
-	ACTION_POST_DELETED   = "post_deleted"
-	ACTION_CHANNEL_VIEWED = "channel_viewed"
-	ACTION_NEW_USER       = "new_user"
-	ACTION_USER_ADDED     = "user_added"
-	ACTION_USER_REMOVED   = "user_removed"
+	ACTION_TYPING             = "typing"
+	ACTION_POSTED             = "posted"
+	ACTION_POST_EDITED        = "post_edited"
+	ACTION_POST_DELETED       = "post_deleted"
+	ACTION_CHANNEL_VIEWED     = "channel_viewed"
+	ACTION_NEW_USER           = "new_user"
+	ACTION_USER_ADDED         = "user_added"
+	ACTION_USER_REMOVED       = "user_removed"
+	ACTION_PREFERENCE_CHANGED = "preference_changed"
 )
 
 type Message struct {