Upgrade bazlets to latest stable-3.0 to build with 3.0.9 API

Change-Id: I92bfd38b30b618480515042b9aef558761a4c1ee

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index e101f49..32e4e6f 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "97eef86854b0fb68b9287831f3075b6f6218ff41",
+    commit = "15eae2ee5cd524a204bd62c3d59bfd0ce86916ec",
     #local_path = "/home/<user>/projects/bazlets",
 )