Pygithub: ssl.SSLError：[SSL：CERTIFICATE_VERIFY_FAILED]証明書の検証に失敗しました（_ssl.c：661）

READMEの例のSSLエラーを取得します。

C:\Python27\python.exe J:\github_repos\aaa\aaa.py
Traceback (most recent call last):
  File "J:\github_repos\aaa\aaa.py", line 7, in <module>
    for repo in g.get_user().get_repos():
  File "C:\Python27\lib\site-packages\github\PaginatedList.py", line 49, in __iter__
    newElements = self._grow()
  File "C:\Python27\lib\site-packages\github\PaginatedList.py", line 61, in _grow
    newElements = self._fetchNextPage()
  File "C:\Python27\lib\site-packages\github\PaginatedList.py", line 163, in _fetchNextPage
    headers=self.__headers
  File "C:\Python27\lib\site-packages\github\Requester.py", line 172, in requestJsonAndCheck
    return self.__check(*self.requestJson(verb, url, parameters, headers, input, cnx))
  File "C:\Python27\lib\site-packages\github\Requester.py", line 213, in requestJson
    return self.__requestEncode(cnx, verb, url, parameters, headers, input, encode)
  File "C:\Python27\lib\site-packages\github\Requester.py", line 252, in __requestEncode
    status, responseHeaders, output = self.__requestRaw(cnx, verb, url, requestHeaders, encoded_input)
  File "C:\Python27\lib\site-packages\github\Requester.py", line 277, in __requestRaw
    requestHeaders
  File "C:\Python27\lib\httplib.py", line 1042, in request
    self._send_request(method, url, body, headers)
  File "C:\Python27\lib\httplib.py", line 1082, in _send_request
    self.endheaders(body)
  File "C:\Python27\lib\httplib.py", line 1038, in endheaders
    self._send_output(message_body)
  File "C:\Python27\lib\httplib.py", line 882, in _send_output
    self.send(msg)
  File "C:\Python27\lib\httplib.py", line 844, in send
    self.connect()
  File "C:\Python27\lib\httplib.py", line 1263, in connect
    server_hostname=server_hostname)
  File "C:\Python27\lib\ssl.py", line 363, in wrap_socket
    _context=self)
  File "C:\Python27\lib\ssl.py", line 611, in __init__
    self.do_handshake()
  File "C:\Python27\lib\ssl.py", line 840, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)

Process finished with exit code 1