Add 'anchor' and 'deprecated' as NonValidationKeywords for v2019-09 draft (#351)

Author: anicolasgar

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

@@ -176,7 +176,9 @@ public static JsonMetaSchema getInstance() {
                             new NonValidationKeyword("default"),
                             new NonValidationKeyword("definitions"),
                             new NonValidationKeyword("$comment"),
-                            new NonValidationKeyword("$defs"),  // newly added in 2018-09 release.
+                            new NonValidationKeyword("$defs"),  // newly added in 2019-09 release.
+                            new NonValidationKeyword("$anchor"),
+                            new NonValidationKeyword("deprecated"),
                             new NonValidationKeyword("contentMediaType"),
                             new NonValidationKeyword("contentEncoding"),
                             new NonValidationKeyword("examples")