Parses `extras_require` configuration file section.

        :param dict section_options:

def parse_section_extras_require(self, section_options):
        """Parses `extras_require` configuration file section.

        :param dict section_options:
        """
        parse_list = partial(self._parse_list, separator=';')
        self['extras_require'] = self._parse_section_to_dict(
            section_options, parse_list)