docs: def download(self):
          """
          Download the archive from the IRS website.
          """
          url = 'http://forms.irs.gov/app/pod/dataDownload/fullData'
          r = requests.get(url, stream=True)
          with open(self.zip_path, 'wb') as f:
              # This is a big file, so we download in chunks
              for chunk in r.iter_content(chunk_size=30720):
                  logger.debug('Downloading...')
                  f.write(chunk)
                  f.flush()