Upgrade bazlets to latest revision

Change-Id: Ib165333a16b3592566afc615f40219f33d7e4136
diff --git a/WORKSPACE b/WORKSPACE
index f5f3369..3e7c59b 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -2,7 +2,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "28aa2290c7f7742261d69b358f3de30d2e87c13b",
+    commit = "b7514d03a7798905ff1513295b46620e57b8f386",
 )
 
 #Snapshot Plugin API