Upgrade bazlets to latest stable-3.0 to build with 3.0.15 API

Change-Id: I471599090b0bef5db28b8274358924ebdae4be50

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index e0d8d5e..7a73b21 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "a010a539824bd467059f414412a47b80101352d7",
+    commit = "a029d8e41d6211c8b23052aa0a0c2c7649577e85",
     #local_path = "/home/<user>/projects/bazlets",
 )