docs: def get_stats_punch_card(self):
          """
          :calls: `GET /repos/:owner/:repo/stats/punch_card <http://developer.github.com/v3/repos/statistics/#get-the-number-of-commits-per-hour-in-each-day>`_
          :rtype: None or :class:`github.StatsPunchCard.StatsPunchCard`
          """
          headers, data = self._requester.requestJsonAndCheck(
              "GET",
              self.url + "/stats/punch_card"
          )
          if not data:
              return None
          else:
              return github.StatsPunchCard.StatsPunchCard(self._requester, headers, data, completed=True)