Update sip binding

Author: pblottiere

python/gui/auto_generated/qgsfeaturelistcombobox.sip.in

@@ -56,6 +56,14 @@ the the value to match the typed text against.
 %Docstring
 An additional expression to further restrict the available features.
 This can be used to integrate additional spatial or other constraints.
+%End
+
+    int nullIndex() const;
+%Docstring
+Returns the current index of the NULL value, or -1 if NULL values are
+not allowed.
+
+.. versionadded:: 3.2
 %End
 
     void setFilterExpression( const QString &filterExpression );
@@ -119,6 +127,13 @@ The index of the currently selected item.
 
   signals:
 
+    void modelUpdated();
+%Docstring
+The underlying model has been updated.
+
+.. versionadded:: 3.2
+%End
+
     void sourceLayerChanged();
 %Docstring
 The layer from which features should be listed.