[buildout] Update minimal value of django-activity-stream

buildout.cfg

@@ -20,7 +20,7 @@ django = >=1.11,<2.0
 django-rest-swagger = >2.1
 django-guardian = >=1.3
 djangorestframework = >3.7
-django-activity-stream = >= 0.6.0
+django-activity-stream = >= 0.6.5
 
 [sysegg]
 recipe = syseggrecipe