Add stable-2.14 build for GitHub plugin

Change-Id: Icf54907a746889b81c3e2e5535b314453af431b4
diff --git a/jenkins/gerrit-mvn-plugin-github.yaml b/jenkins/gerrit-mvn-plugin-github.yaml
index e2b2067..c06db5a 100644
--- a/jenkins/gerrit-mvn-plugin-github.yaml
+++ b/jenkins/gerrit-mvn-plugin-github.yaml
@@ -3,6 +3,7 @@
     repo: github
     branch:
       - master
+      - stable-2.14
       - stable-2.13
       - stable-2.12
       - stable-2.11