Use OrganizationReference, not Organization, closes open-contracting/ocds-extensions#36

Author: James McKinney

release-schema.json

@@ -37,7 +37,7 @@
         "author": {
           "title": "Question author",
           "description": "The identifier and name of the party asking this question. Questioners may be listed in the parties array with a role of 'enquirer'. Procurement policies vary on whether or not the identity of those asking questions should be disclosed, or at which stage this information may be disclosed. When the identity of the questioner cannot be disclosed leave the author section blank. Display systems should interpret this as an anonymous question.",
-          "$ref": "#/definitions/Organization"
+          "$ref": "#/definitions/OrganizationReference"
         },
         "title": {
           "title": "Question title",