Fix raven version: 6.9.0

Author: ulgens

requirements.txt

@@ -16,6 +16,6 @@ boto3==1.7.70
 django-storages==1.6.6
 django-markdownx==2.0.23
 python-slugify==1.2.5
-raven>=3
+raven==6.9.0
 django-meta==1.4.1
 django-taggit==0.22.2