Upgrade bazlets to latest stable-3.1 to build with 3.1.4 API

Change-Id: I0f309ed0a79cf31f26d701e0250ae17274e45306

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 452faee..dcb4416 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "65536a2b01b0097ee3237bb48a805ed97ca51467",
+    commit = "fc1bfdf008c4b07e7cc4214fdacf25560276f9c4",
     #local_path = "/home/<user>/projects/bazlets",
 )