[buildout] Fix minimum version of django-jsonfield

buildout.cfg

@@ -21,6 +21,7 @@ django-rest-swagger = >2.1
 django-guardian = >=1.3
 djangorestframework = >3.7
 django-activity-stream = >= 0.6.5
+django-jsonield = >= 1.0.1
 
 [sysegg]
 recipe = syseggrecipe