Fix '$ref' validation.

IvanGoncharov · IvanGoncharov · commit d30527de8092 · 2015-07-15T18:59:39.000+03:00
diff --git a/schemas/v2.0/schema.json b/schemas/v2.0/schema.json
@@ -1484,6 +1484,7 @@
     },
     "jsonReference": {
       "type": "object",
+      "required": ["$ref"],
       "additionalProperties": false,
       "properties": {
         "$ref": {
