chore(requirements): Update DRF to 3.4.5 (#997)

http://www.django-rest-framework.org/topics/release-notes/#345

Author: helgi

rootfs/requirements.txt

@@ -3,7 +3,7 @@ backoff==1.3.1
 Django==1.10.0
 django-cors-middleware==1.3.1
 django-guardian==1.4.5
-djangorestframework==3.4.4
+djangorestframework==3.4.5
 docker-py==1.9.0
 gunicorn==19.6.0
 jmespath==0.9.0