Bumping version to 1.9-SNAPSHOT

Change-Id: I70d7bdeff1e2ebf46325fa99e610c0d1feed14f9
diff --git a/plugin/pom.xml b/plugin/pom.xml
index c63b7fb..b4485bc 100644
--- a/plugin/pom.xml
+++ b/plugin/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>org.onosproject</groupId>
         <artifactId>onos-yang-tools</artifactId>
-        <version>1.8</version>
+        <version>1.9-SNAPSHOT</version>
     </parent>
 
     <artifactId>onos-yang-maven-plugin</artifactId>