Upgrade to latest bazlets

Change-Id: Iec03ee511f79d5bd8bf5618c9a40ce976eeac433
diff --git a/WORKSPACE b/WORKSPACE
index 334b195..3ce4d00 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "f2e78d4042490178a9cc1da59fc590dec55278cb",
+    commit = "42bffc66c0e92753133e4cea2debe65abc359c4d",
     #    local_path = "/home/<user>/projects/bazlets",
 )