Convert request version to two elements tuple.

        parser HTTP version '1.1' => (1, 1)

def update_version(self, version: Union[http.HttpVersion, str]) -> None:
        """Convert request version to two elements tuple.

        parser HTTP version '1.1' => (1, 1)
        """
        if isinstance(version, str):
            v = [l.strip() for l in version.split('.', 1)]
            try:
                version = http.HttpVersion(int(v[0]), int(v[1]))
            except ValueError:
                raise ValueError(
                    'Can not parse http version number: {}'
                    .format(version)) from None
        self.version = version