Build with API version 2.9

Change-Id: I5598a53d5116f92da04d52409eac1d6243381e00
diff --git a/pom.xml b/pom.xml
index 5e71052..ba3a084 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
   <modelVersion>4.0.0</modelVersion>
   <artifactId>gravatar-avatar-provider</artifactId>
   <groupId>com.googlesource.gerrit.plugins.avatar_providers</groupId>
-  <version>2.8</version>
+  <version>2.9</version>
   <packaging>jar</packaging>
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>