Upgrade bazlets to latest master to build with 2.16-rc3 API

Change-Id: I4bcf6beb98fa44eef490dce31861b684ff618af7

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 4cdbf86..6b658d4 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "e4662688b3f482cf5789b27a1ea726e8d0aabfc8",
+    commit = "d044cd60d37e302d9ac324f7a2c4e48b4011d4e6",
     #local_path = "/home/<user>/projects/bazlets",
 )