Update API version to 2.9-SNAPSHOT in pom.xml

Change-Id: Ica196a05892c74be666ad879b9d1a33df63b06ab
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

pom.xml

diff --git a/pom.xml b/pom.xml
index 6db3f29..434c0a2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@
   <name>commit-message-length-validator</name>
   <groupId>com.googlesource.gerrit.plugins.validators</groupId>
   <packaging>jar</packaging>
-  <version>2.8-SNAPSHOT</version>
+  <version>2.9-SNAPSHOT</version>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>