Upgrade bazlets to latest stable-2.16

Change-Id: I88ac6498703cd1ff1927c1169e9c1680d83174a4
diff --git a/WORKSPACE b/WORKSPACE
index ddd16da..ddc186e 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",
 )