Upgrade bazlets to latest master to build with 3.0.0 API

Change-Id: I4d1ac686b452af5fc51bc0d97f2a66226ef4510d
diff --git a/WORKSPACE b/WORKSPACE
index 8eee164..fcf92a0 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "298b25cf8c5ef0f27caa215cbc128e530f68d9f4",
+    commit = "c9dad39dbf8c9fa3ec955ac5fb3e2312163136ee",
     #local_path = "/home/<user>/projects/bazlets",
 )