updated readme with explanation about the updated signal and an example

README.md

@@ -106,4 +106,31 @@ modifier = QtCore.Qt.ControlModifier | QtCore.Qt.ShiftModifier
 
 menu = ScriptsMenu()
 menu.register_callback(modifier, callback)
+```
+
+#### Update menu
+
+The ScriptsMenu has a signal called "updated" which can be connected to a function which
+rebuilds the menu
+
+```python
+# This example is tested in Autodesk Maya
+import scriptsmenu.launchformaya as launchformaya
+
+# Here we create our own menu without any scripts
+menu = launchformaya.main(title="Custom Menu")
+
+# Set the update button visible, which is hidden by default
+menu.set_update_visible(True)
+
+# Add a custom script to the menu
+menu.add_script(parent=menu, title="Before", command='print("C")', sourcetype="python")
+
+# Create update function
+def update(menu):
+    menu.clear_menu()
+    menu.add_script(parent=menu, title="After", command='print("C")', sourcetype="python")
+
+# Link the update function to the update signal
+menu.updated.connect(update)
 ```