Depend on a recent enough slumber revision claiming python3 support

EvaSDK · Julien Castets · commit 3ef929d942bf · 2015-10-12T12:27:20.000+02:00
diff --git a/setup.py b/setup.py
@@ -50,7 +50,7 @@ def get_long_description():
     license='BSD',
 
     install_requires=[
-        'slumber >= 0.6.0',
+        'slumber >= 0.6.2',
         'pyOpenSSL',
         'ndg-httpsclient',
         'pyasn1',
