Build saml against gerrit stable-3.6

Bug: Issue 15831
Change-Id: I05b18107a506e67927c8a2119c8b4914fa6c4d93
diff --git a/jenkins/gerrit-plugin-saml.yaml b/jenkins/gerrit-plugin-saml.yaml
index ea39a69..bf72ef0 100644
--- a/jenkins/gerrit-plugin-saml.yaml
+++ b/jenkins/gerrit-plugin-saml.yaml
@@ -10,4 +10,5 @@
           branch:
             - master
           gerrit-branch:
+            - stable-3.6
             - stable-3.5