fixes #232 update meta schema URI to https

Author: stevehu

src/main/java/com/networknt/schema/JsonMetaSchema.java

@@ -151,7 +151,7 @@ public static JsonMetaSchema getInstance() {
     }
 
     private static class V201909 {
-        private static String URI = "http://json-schema.org/draft/2019-09/schema#";
+        private static String URI = "https://json-schema.org/draft/2019-09/schema";
         private static final String ID = "$id";
 
         public static final List<Format> BUILTIN_FORMATS = new ArrayList<>(JsonMetaSchema.COMMON_BUILTIN_FORMATS);
@@ -172,7 +172,8 @@ public static JsonMetaSchema getInstance() {
                             new NonValidationKeyword("title"),
                             new NonValidationKeyword("description"),
                             new NonValidationKeyword("default"),
-                            new NonValidationKeyword("definitions")
+                            new NonValidationKeyword("definitions"),
+                            new NonValidationKeyword("$defs")  // newly added in 2018-09 release.
                     ))
                     .build();
         }

src/test/java/com/networknt/schema/V7JsonSchemaTest.java

@@ -267,9 +267,8 @@ public void testDefaultValidator() throws Exception {
     }
 
     @Test
-    @Ignore
     public void testDefsValidator() throws Exception {
-        runTestFile("draft7/defs.json");
+        runTestFile("draft7/definitions.json");
     }
 
     @Test