Build against Gerrit 2.9

Change-Id: Ie0a4af7b3986467172abf5796681e3b4f4fc36d0
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/pom.xml b/pom.xml
index c3bb7be..9be9335 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
 
   <properties>
     <Gerrit-ApiType>plugin</Gerrit-ApiType>
-    <Gerrit-ApiVersion>2.9-SNAPSHOT</Gerrit-ApiVersion>
+    <Gerrit-ApiVersion>2.9</Gerrit-ApiVersion>
   </properties>
 
   <build>