Add missing sip binding

python/gui/effects/qgseffectstackpropertieswidget.sip

@@ -207,4 +207,10 @@ class QgsEffectStackCompactWidget : QWidget
      */
     void changed();
 
+    /** Emitted when a panel is shown in the widget.
+     * @param widget widget panel which was shown
+     * @note added in QGIS 2.16
+     */
+    void showPanel( QgsRendererWidgetContainer* widget );
+
 };