Build events-log against gerrit 3.3

Change-Id: Ibd7d882dc92c30659c1fac36397e9893b42af563
diff --git a/jenkins/gerrit-bazel-plugin-events-log.yaml b/jenkins/gerrit-bazel-plugin-events-log.yaml
index 569f2ae..d1113db 100644
--- a/jenkins/gerrit-bazel-plugin-events-log.yaml
+++ b/jenkins/gerrit-bazel-plugin-events-log.yaml
@@ -6,6 +6,7 @@
             - master
           gerrit-branch:
             - master
+            - stable-3.3
             - stable-3.2
       - 'plugin-{name}-bazel-{branch}':
           branch: