Set an integer option.

            Args:
                option (str): name of option.
                value (int): value of the option.

            Raises:
                ValueError: Value must be an integer.

def set_integer(self, option, value):
        """Set an integer option.

            Args:
                option (str): name of option.
                value (int): value of the option.

            Raises:
                ValueError: Value must be an integer.
        """
        try:
            int_value = int(value)
        except ValueError as err:
            print(err.args)

        self.options[option] = value