Upgrade to latest bazlets

Change-Id: I41f284a6cdf05b569681a1adccd4faeb45a3d125
diff --git a/WORKSPACE b/WORKSPACE
index 68d9be1..d72ab7f 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "b7514d03a7798905ff1513295b46620e57b8f386",
+    commit = "4f3e1b6a4938dd3d390e0badbc9e033ccfaaabc5",
     #    local_path = "/home/<user>/projects/bazlets",
 )
 
diff --git a/bazlets.bzl b/bazlets.bzl
index e14e488..b5c240c 100644
--- a/bazlets.bzl
+++ b/bazlets.bzl
@@ -1,7 +1,7 @@
 NAME = "com_googlesource_gerrit_bazlets"
 
 def load_bazlets(
-    commit,
+    commit = None,
     local_path = None
   ):
   if not local_path: