Upgrade bazlets to latest stable-3.0 to build with 3.0.1 API

Change-Id: Ie63159549f332bc6c0e10a797b7f4e1e21466490

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index c9ba4b8..27c3554 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "51049da0140c58ee26f8285bca4393c5e43ce4a1",
+    commit = "f4a0de709185c5447fed6fdce124dc5d33065ca1",
     #local_path = "/home/<user>/projects/bazlets",
 )