update yang tool version in lib/pom.xml

Change-Id: Ib7e6c9d926e7d162eddb3e2f467d809837f36912
diff --git a/lib/pom.xml b/lib/pom.xml
index 1ec77c7..c4d68fd 100644
--- a/lib/pom.xml
+++ b/lib/pom.xml
@@ -40,7 +40,7 @@
         <netty4.version>4.1.8.Final</netty4.version>
         <openflowj.version>3.2.0.onos</openflowj.version>
         <onos-maven-plugin.version>${project.version}</onos-maven-plugin.version>
-        <onos-yang-tools.version>2.4</onos-yang-tools.version>
+        <onos-yang-tools.version>2.4.1</onos-yang-tools.version>
         <osgi.version>5.0.0</osgi.version>
         <karaf.version>3.0.8</karaf.version>
         <jersey.version>2.26</jersey.version>