chore(requirements): update django-jsonfield to 2.0.2

See https://github.com/dmkoch/django-jsonfield/blob/master/CHANGES.rst#v202-6182017

Author: mboersma

rootfs/requirements.txt

@@ -9,7 +9,7 @@ docker-py==1.10.6
 gunicorn==19.7.1
 idna==2.5
 jmespath==0.9.3
-jsonfield==2.0.1
+jsonfield==2.0.2
 jsonschema==2.6.0
 morph==0.1.2
 ndg-httpsclient==0.4.2