Upgrade bazlets to latest stable-3.1

Change-Id: I828bc6ad86984504da6e0db67760f3f03e944ad4
diff --git a/WORKSPACE b/WORKSPACE
index f70d01a..96a6228 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "fbe2b2fd07c95d752dced6b8624c9d5a08e8c6c6",
+    commit = "56aafc4c0bb1b72fba34f5bdfb29ddb1e1a17801",
     #local_path = "/home/<user>/projects/bazlets",
 )