Release app version 2.9.0 with API version 2.9.0

Change-Id: I9373fd190eaca93536c31415b1d481f4342cdc0d
diff --git a/app/pom.xml b/app/pom.xml
index dd236c8..161b607 100644
--- a/app/pom.xml
+++ b/app/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <artifactId>onos-app-igmpproxy</artifactId>
         <groupId>org.opencord</groupId>
-        <version>2.9.0-SNAPSHOT</version>
+        <version>2.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>