Upgrade bazlets to latest stable-2.16

Change-Id: Ibd1183650d77ae3f21c8c6ad0251e674801e22de

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 3f0714a..79c64a0 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "1b6fc9b39001806b37a4eedbb0a4816daf1a227d",
+    commit = "2ad931eb07d5a43c7a26132716a1411a47fcbfdf",
     #local_path = "/home/<user>/projects/bazlets",
 )