Merge pull request #582 from santhosh-tekuri/defs

Replace '$defs' with 'definitions' in draft 6,7

Author: Julian

tests/draft6/ref.json

@@ -763,7 +763,7 @@
             "properties": {
                 "foo": {"$ref": "urn:uuid:deadbeef-1234-ff00-00ff-4321feebdaed#something"}
             },
-            "$defs": {
+            "definitions": {
                 "bar": {
                     "$id": "#something",
                     "type": "string"

tests/draft7/ref.json

@@ -799,7 +799,7 @@
             "properties": {
                 "foo": {"$ref": "urn:uuid:deadbeef-1234-ff00-00ff-4321feebdaed#something"}
             },
-            "$defs": {
+            "definitions": {
                 "bar": {
                     "$id": "#something",
                     "type": "string"