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

Change-Id: Ie96bde65c228ddf977cf011ac266fb07485fbfe4

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index e0f63a2..316a280 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",
 )