Updated dependency on the latest OLT app

Change-Id: I3ba245eb96f51f9b6fd9d76453846f1569221d52
diff --git a/pom.xml b/pom.xml
index 2ce36cb..10b71ab 100644
--- a/pom.xml
+++ b/pom.xml
@@ -38,7 +38,7 @@
         <onos.app.url>http://opencord.org</onos.app.url>
         <onos.app.readme>Integration with Kafka event bus</onos.app.readme>
         <aaa.api.version>2.1.0</aaa.api.version>
-        <olt.api.version>4.1.1</olt.api.version>
+        <olt.api.version>4.2.0-SNAPSHOT</olt.api.version>
         <dhcpl2relay.api.version>2.1.0</dhcpl2relay.api.version>
         <bng.api.version>1.0.0</bng.api.version>
         <sadis.api.version>5.1.0</sadis.api.version>