Set bazlets to latest stable-3.1 to build with 3.1.3 API

Change-Id: I3784ddf4ed78106402caec78ae3a26582829e84c
diff --git a/WORKSPACE b/WORKSPACE
index c6d72e9..793b9cd 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "f30a992da9fc855dce819875afb59f9dd6f860cd",
+    commit = "300de940c226c4ef7f0ce4baa90e278ae0fa840c",
     #local_path = "/home/<user>/projects/bazlets",
 )