Build the messageoftheday plugin on stable-2.16 and master

Change-Id: I2e564d581162b044ac7e90bbeab2ec44b927106c
diff --git a/jenkins/gerrit-bazel-plugin-messageoftheday.yaml b/jenkins/gerrit-bazel-plugin-messageoftheday.yaml
index 4799ffa..f8ce668 100644
--- a/jenkins/gerrit-bazel-plugin-messageoftheday.yaml
+++ b/jenkins/gerrit-bazel-plugin-messageoftheday.yaml
@@ -3,5 +3,7 @@
     jobs:
       - 'plugin-{name}-bazel-{branch}':
           branch:
+            - master
+            - stable-2.16
             - stable-2.15
             - stable-2.14