Merge pull request #475 from NoumirPoutipou/master

Pin an explicit version of django-filter (<2) on cookbook example

Author: syrusakbary

examples/cookbook/requirements.txt

@@ -2,4 +2,4 @@ graphene
 graphene-django
 graphql-core>=2.1rc1
 django==1.9
-django-filter==0.11.0
+django-filter<2