Updating yify's URL -> yts.re

Was failing with
```
/usr/lib/python2.7/site-packages/requests/adapters.pyc in send(self, request, stream, timeout, verify, cert, proxies)
    380         except (_SSLError, _HTTPError) as e:
    381             if isinstance(e, _SSLError):
--> 382                 raise SSLError(e, request=request)
    383             elif isinstance(e, TimeoutError):
    384                 raise Timeout(e, request=request)

SSLError: hostname 'yify-torrents.com' doesn't match either of '*.yts.re', 'yts.re'
```