Bumping version to 1.9-SNAPSHOT

Change-Id: I70d7bdeff1e2ebf46325fa99e610c0d1feed14f9
diff --git a/pom.xml b/pom.xml
index 47fcc51..60e02cd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
 
     <groupId>org.onosproject</groupId>
     <artifactId>onos-yang-tools</artifactId>
-    <version>1.8</version>
+    <version>1.9-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <properties>