Upgrade bazlets to latest stable-3.0

Change-Id: Ibe523239107bf7eadc1add2261b06e26c88dea1d

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index f1961d8..3e1bc3f 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "96f691ebbf4ef1c46b798e871ed5acd9d844651c",
+    commit = "4909dd878ded009edc140319246a2e0681763743",
     #local_path = "/home/<user>/projects/bazlets",
 )