Build events-log plugin on stable-3.4 branch

Change-Id: Ia2642ec6493ff2ec0c68b836dcf416fd8157f685
diff --git a/jenkins/gerrit-bazel-plugin-events-log.yaml b/jenkins/gerrit-bazel-plugin-events-log.yaml
index d1113db..0e9a06b 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-3.4
             - stable-3.3
             - stable-3.2
       - 'plugin-{name}-bazel-{branch}':