Urllib: disable SSL sertificates check

import ssl
ssl._create_default_https_context = ssl._create_unverified_context

Fix for local environment for example for such exceptions:

Traceback (most recent call last):
  File "/home/alexey/anaconda3/envs/torch_04/lib/python3.7/urllib/request.py", line 1317, in do_open
    encode_chunked=req.has_header('Transfer-encoding'))
  File "/home/alexey/anaconda3/envs/torch_04/lib/python3.7/http/client.py", line 1244, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/home/alexey/anaconda3/envs/torch_04/lib/python3.7/http/client.py", line 1290, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/home/alexey/anaconda3/envs/torch_04/lib/python3.7/http/client.py", line 1239, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/home/alexey/anaconda3/envs/torch_04/lib/python3.7/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/home/alexey/anaconda3/envs/torch_04/lib/python3.7/http/client.py", line 966, in send
    self.connect()
  File "/home/alexey/anaconda3/envs/torch_04/lib/python3.7/http/client.py", line 1414, in connect
    server_hostname=server_hostname)
  File "/home/alexey/anaconda3/envs/torch_04/lib/python3.7/ssl.py", line 423, in wrap_socket
    session=session
  File "/home/alexey/anaconda3/envs/torch_04/lib/python3.7/ssl.py", line 870, in _create
    self.do_handshake()
  File "/home/alexey/anaconda3/envs/torch_04/lib/python3.7/ssl.py", line 1139, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1076)