Upgrade bazlets to latest master to build with 3.1.3 API

Change-Id: Idf39402bf5b9b43f5a44d76c34ef305e38ebd0e0

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 22f0515..2bfdfe0 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "fbe2b2fd07c95d752dced6b8624c9d5a08e8c6c6",
+    commit = "f30a992da9fc855dce819875afb59f9dd6f860cd",
     #local_path = "/home/<user>/projects/bazlets",
 )