Fix error in urllib import with python3 try2

Author: Martin Journois

folium/plugins/terminator.py

@@ -1,6 +1,9 @@
 # -*- coding: utf-8 -*-
 
-from future.moves.urllib.request import urlopen as _urlopen
+try:
+    from urllib.request import urlopen as _urlopen
+except:
+    from urllib import urlopen as _urlopen
 
 from .plugin import Plugin