code: def get_tag(self, version):
          
          for rel in self._repo.releases():
              if rel.tag_name == version:
                  return rel.name, rel.html_url
          return None, None
docs: Check GitHub for a release with the specified tag name. If present,
          return a 2-tuple of the release name and release HTML URL. Otherwise,
          return a 2-tuple of None, None (tag not present).
  
          :param version: the tag name to check for
          :type version: str
          :return: 2-tuple of release name, release HTML URL for the specified
            release tag, or 2-tuple of None, None if no such release
          :rtype: tuple