docs: def login(session):
      """Login to Voobly."""
      if not session.auth.username or not session.auth.password:
          raise VooblyError('must supply username and password')
      _LOGGER.info("logging in (no valid cookie found)")
      session.cookies.clear()
      try:
          session.get(session.auth.base_url + LOGIN_PAGE)
          resp = session.post(session.auth.base_url + LOGIN_URL, data={
              'username': session.auth.username,
              'password': session.auth.password
          })
      except RequestException:
          raise VooblyError('failed to connect for login')
      if resp.status_code != 200:
          raise VooblyError('failed to login')
      _save_cookies(session.cookies, session.auth.cookie_path)