message: WidgetEchoStore improve update event to include roomId and widgetId
diff: @@ -93,13 +93,13 @@ class WidgetEchoStore extends EventEmitter {
  if (this._roomWidgetEcho[roomId] === undefined) this._roomWidgetEcho[roomId] = {};
  this._roomWidgetEcho[roomId][widgetId] = state;
  - this.emit('update');
  + this.emit('update', roomId, widgetId);
  }
  removeRoomWidgetEcho(roomId, widgetId) {
  delete this._roomWidgetEcho[roomId][widgetId];
  if (Object.keys(this._roomWidgetEcho[roomId]).length === 0) delete this._roomWidgetEcho[roomId];
  - this.emit('update');
  + this.emit('update', roomId, widgetId);
  }
  }
  