Build task master against Gerrit 3.7

Change-Id: I9e3b75ca5a25f24f1b634a66e5a2f2eaa77c8fc1
diff --git a/jenkins/gerrit-bazel-plugin-task.yaml b/jenkins/gerrit-bazel-plugin-task.yaml
index 0d04117..c86b25e 100644
--- a/jenkins/gerrit-bazel-plugin-task.yaml
+++ b/jenkins/gerrit-bazel-plugin-task.yaml
@@ -6,6 +6,7 @@
             - master
           gerrit-branch:
             - master
+            - stable-3.7
             - stable-3.6
             - stable-3.5
             - stable-3.4