docs: def tags(self):
          """
          Returns a data frame of all tags in origin.  The DataFrame will have the columns:
  
           * repository
           * tag
  
          :returns: DataFrame
          """
  
          tags = self.repo.tags
          df = DataFrame([x.name for x in list(tags)], columns=['tag'])
          df['repository'] = self._repo_name()
  
          return df