Bumping onos-maven-plugin version to 1.6-SNAPSHOT

Change-Id: I59e1e2e960b4563285edd8fd638a240165e43a75
diff --git a/tools/package/maven-plugin/pom.xml b/tools/package/maven-plugin/pom.xml
index d982134..54839b1 100644
--- a/tools/package/maven-plugin/pom.xml
+++ b/tools/package/maven-plugin/pom.xml
@@ -24,7 +24,7 @@
     </parent>
 
     <artifactId>onos-maven-plugin</artifactId>
-    <version>1.5</version>
+    <version>1.6-SNAPSHOT</version>
     <packaging>maven-plugin</packaging>
 
     <description>Maven plugin for packaging ONOS applications or generating