Update API version to 2.9-SNAPSHOT in pom.xml

Change-Id: I137e3f5906f366ce3415c7c45a8be062574626c8
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/pom.xml b/pom.xml
index ba5ac6c..f1b29a1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,7 +22,7 @@
   <groupId>com.googlesource.gerrit.plugins.reviewnotes</groupId>
   <artifactId>reviewnotes</artifactId>
   <packaging>jar</packaging>
-  <version>2.8-SNAPSHOT</version>
+  <version>2.9-SNAPSHOT</version>
   <name>reviewnotes</name>
 
   <properties>