def update(self, title=None, body=None, icon=None):
return False<EOL>
Update this notification.

:param title: Title of the notification
:param body: Body text of the notification, depending on the users system configuration HTML may be used, but is not recommended
:param icon: A XDG icon name, see http://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html

:return boolean indicating success