add minimum version for six

thijstriemstra · thijstriemstra · commit 854c7eb9b2d5 · 2015-03-25T17:17:42.000+01:00
diff --git a/requirements.txt b/requirements.txt
@@ -2,7 +2,7 @@
 Django>=1.4.5,<1.8
 babel==1.3
 jinja2
-six
+six>=1.9.0
 translate-toolkit
 -e git://github.com/jbalogh/jingo.git#egg=jingo
 
