Merge pull request #1241 from mboersma/update-jsonschema

chore(requirements): update jsonschema library

Author: mboersma

rootfs/requirements.txt

@@ -10,7 +10,7 @@ gunicorn==19.6.0
 idna==2.2
 jmespath==0.9.1
 jsonfield==1.0.3
-jsonschema==2.5.1
+jsonschema==2.6.0
 morph==0.1.2
 ndg-httpsclient==0.4.2
 packaging==16.8