Upgrade bazlets to latest master to build with 3.0.0-rc2 API

Change-Id: I7ad5d614f85e69fa4b3c1e3eda7b6157e1ec644c
diff --git a/WORKSPACE b/WORKSPACE
index 0656a52..eeb6ef8 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "8808e401a9c68a02ae541c36a36dd672a171b7e7",
+    commit = "3bab941eed2637378f9e808b05778325eed2a19b",
     #local_path = "/home/<user>/projects/bazlets",
 )