Explicitly depend on six, rather than waiting for a dependency to bring it in.

gthank · gthank · commit eee0978eaecf · 2017-05-30T17:47:34.000-04:00
diff --git a/requirements/pip.txt b/requirements/pip.txt
@@ -9,6 +9,7 @@ Pygments==2.2.0
 mkdocs==0.14.0
 readthedocs-build==2.0.6
 django==1.9.12
+six==1.10.0
 
 django-tastypie==0.13.0
 django-haystack==2.6.0
