[ONOS-4351][ONOS-4524] Augment linking and defect fixed.

Change-Id: I7c8e8c90579eea4631e014c4906a543a3c249427
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/YangNotification.java b/src/main/java/org/onosproject/yangutils/datamodel/YangNotification.java
index e7b0241..5e81f64 100644
--- a/src/main/java/org/onosproject/yangutils/datamodel/YangNotification.java
+++ b/src/main/java/org/onosproject/yangutils/datamodel/YangNotification.java
@@ -74,8 +74,8 @@
 /**
  * Represents data model node to maintain information defined in YANG notification.
  */
-public class YangNotification extends YangNode implements YangLeavesHolder, YangCommonInfo, Parsable,
-        CollisionDetector {
+public class YangNotification extends YangNode
+        implements YangLeavesHolder, YangCommonInfo, Parsable, CollisionDetector, YangAugmentationHolder {
 
     /**
      * Name of the notification.