chore(requirements): update docker-py to 1.10.4 (#1115)

https://github.com/docker/docker-py/blob/release/docs/change_log.md#1104

Author: helgi

rootfs/requirements.txt

@@ -4,7 +4,7 @@ Django==1.10.2
 django-cors-middleware==1.3.1
 django-guardian==1.4.6
 djangorestframework==3.4.7
-docker-py==1.10.3
+docker-py==1.10.4
 gunicorn==19.6.0
 jmespath==0.9.0
 jsonfield==1.0.3