SSL support?

What can I do to enable SSL support?
```
https://www.nu.nl/ error Cannot connect to host www.nu.nl:443 ssl:None [[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777)]
Finished 1 urls in 0.618 secs (max_workers=5) (0.324 urls/sec/task)
         1 fail
         1 fail_ClientConnectorSSLError
```

