Upgrade bazlets to latest stable-3.1

Change-Id: I35952b9c4fca9a3f72ea09c325246a048c54612d

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index eb40354..c96568d 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "69ae6ee516ec1cc51d0a07fe4419a325eb9063ce",
+    commit = "bd8db0cf3057397bcf7287c28cc93886e663989b",
     #local_path = "/home/<user>/projects/bazlets",
 )