Upgrade bazlets to latest stable-2.16 to build with 2.16.11.1 API

Change-Id: I9ad666e0864d4e58acfda6c2886bf84f4f85a095

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 20550be..0a5f9b8 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "5514e42e08d7852d226849e391857d7f139f7ed9",
+    commit = "3df1fac2202ac2a42cec61fac8c502178c9af391",
     #local_path = "/home/<user>/projects/bazlets",
 )