Write line

        :param text:
        :param sep:
        :return:

def write_ln(self, *text, sep=' '):
        """
        Write line

        :param text:
        :param sep:
        :return:
        """
        if self.text and self.text[-1] != '\n':
            self.text += '\n'
        self.text += markdown.text(*text, sep) + '\n'
        return self