pass event in the Room.tags event

lib/models/room.js

@@ -473,7 +473,7 @@ Room.prototype.addTags = function(event) {
 
     // XXX: we could do a deep-comparison to see if the tags have really
     // changed - but do we want to bother?
-    this.emit("Room.tags", this);
+    this.emit("Room.tags", event, this);
 };
 
 function setEventMetadata(event, stateContext, toStartOfTimeline) {
@@ -618,10 +618,11 @@ module.exports = Room;
 /**
  * Fires whenever a room's tags are updated.
  * @event module:client~MatrixClient#"Room.tags"
+ * @param {event} event The tags event
  * @param {Room} room The room whose Room.tags was updated.
  * @example
- * matrixClient.on("Room.tags", function(room){
- *   var newTags = room.tags;
+ * matrixClient.on("Room.tags", function(event, room){
+ *   var newTags = event.getContent().tags;
  *   if (newTags["favourite"]) showStar(room);
  * });
  */