diff --git a/vendor/github.com/xdg/scram/doc.go b/vendor/github.com/xdg/scram/doc.go
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+++ b/vendor/github.com/xdg/scram/doc.go
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+// Copyright 2018 by David A. Golden. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+// Package scram provides client and server implementations of the Salted
+// Challenge Response Authentication Mechanism (SCRAM) described in RFC-5802
+// and RFC-7677.
+//
+// Usage
+//
+// The scram package provides two variables, `SHA1` and `SHA256`, that are
+// used to construct Client or Server objects.
+//
+//     clientSHA1,   err := scram.SHA1.NewClient(username, password, authID)
+//     clientSHA256, err := scram.SHA256.NewClient(username, password, authID)
+//
+//     serverSHA1,   err := scram.SHA1.NewServer(credentialLookupFcn)
+//     serverSHA256, err := scram.SHA256.NewServer(credentialLookupFcn)
+//
+// These objects are used to construct ClientConversation or
+// ServerConversation objects that are used to carry out authentication.
+package scram