Upgrade bazlets to latest stable-3.1 to build with 3.1.11 API

Change-Id: I1e9b8a3b3f1404be2d6f29b6019179c3d13d729b

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 3359259..d3a542d 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "91ea277efd6d9f24c18d6ddeba65bed866b00872",
+    commit = "20079f696c22c733053077b13c0dc6d9902e6b8e",
     #local_path = "/home/<user>/projects/bazlets",
 )