FIX certificate error

Author: joaopfonseca

research/datasets/tests/test_datasets.py

@@ -1,9 +1,12 @@
 from urllib.request import urlopen
 import multiprocessing.dummy as mp
 from multiprocessing import cpu_count
+import ssl
 
 from .._base import FETCH_URLS
 
+ssl._create_default_https_context = ssl._create_unverified_context
+
 
 def test_urls():
     """Test whether URLS are working."""