Build events-log against 3.8

Change-Id: Ia504f07e2df1f948b40051d2fd8c0d29308e82bb
diff --git a/jenkins/gerrit-bazel-plugin-events-log.yaml b/jenkins/gerrit-bazel-plugin-events-log.yaml
index a2e3a07..0f81529 100644
--- a/jenkins/gerrit-bazel-plugin-events-log.yaml
+++ b/jenkins/gerrit-bazel-plugin-events-log.yaml
@@ -7,6 +7,7 @@
             - master
           gerrit-branch:
             - master
+            - stable-3.8
             - stable-3.7
             - stable-3.6
             - stable-3.5