Build reviewers plugin on stable-3.1[1-3]

Change-Id: Ifdb6eac394fdddb5bbb67c6e8d9b2b5e9a33cbdb

jenkins/gerrit-bazel-plugin-reviewers.yaml

diff --git a/jenkins/gerrit-bazel-plugin-reviewers.yaml b/jenkins/gerrit-bazel-plugin-reviewers.yaml
index 0b916c6..7b665bb 100644
--- a/jenkins/gerrit-bazel-plugin-reviewers.yaml
+++ b/jenkins/gerrit-bazel-plugin-reviewers.yaml
@@ -4,11 +4,11 @@
       - 'plugin-{name}-bazel-{branch}':
           branch:
             - master
+            - stable-3.13
+            - stable-3.12
+            - stable-3.11
       - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
           branch:
             - master
           gerrit-branch:
-            - stable-3.11
-            - stable-3.12
-            - stable-3.13
             - stable-3.14