Change minimum version for stress suite.

Change stress suite to run on >=R37.

BUG=None
TEST=None

Change-Id: Ief487b35c44df7f9d5f09b7d8a93ec2fbeef7f89
Reviewed-on: https://chromium-review.googlesource.com/210521
Reviewed-by: Kris Rambish <krisr@chromium.org>
Tested-by: Yusuf Mohsinally <mohsinally@chromium.org>
Commit-Queue: Yusuf Mohsinally <mohsinally@chromium.org>
diff --git a/suite_scheduler.ini b/suite_scheduler.ini
index 1fc78fd..6a098fc 100644
--- a/suite_scheduler.ini
+++ b/suite_scheduler.ini
@@ -326,7 +326,7 @@
 [NightlyStress]
 run_on: nightly
 suite: stress
-branch_specs: >=R36
+branch_specs: >=R37
 pool: stress
 
 [Gizmo]