Update warning list menu

def update_warning_menu(self):
        """Update warning list menu"""
        editor = self.get_current_editor()
        check_results = editor.get_current_warnings()
        self.warning_menu.clear()
        filename = self.get_current_filename()
        for message, line_number in check_results:
            error = 'syntax' in message
            text = message[:1].upper() + message[1:]
            icon = ima.icon('error') if error else ima.icon('warning')
            slot = lambda _checked, _l=line_number: self.load(filename, goto=_l)
            action = create_action(self, text=text, icon=icon, triggered=slot)
            self.warning_menu.addAction(action)