Allow usage of the future module.

Roland Hedberg · Roland Hedberg · commit 166c8dc47ae9 · 2015-11-19T11:03:00.000+01:00
diff --git a/setup.py b/setup.py
@@ -17,7 +17,8 @@
     'pytz',
     'pyOpenSSL',
     'python-dateutil',
-    'six'
+    'six',
+    'future'
 ]
 
 version = ''
