Add 2019-09 to qri-io

Author: feep

_data/validator-libraries-modern.yml

@@ -84,7 +84,7 @@
       license: BSD-3-Clause
     - name: qri-io/jsonschema
       url: https://github.com/qri-io/jsonschema
-      date-draft:
+      date-draft: [2019-09]
       draft: [7]
       license: MIT
       notes: includes custom validator support, rich error returns