lib/connections: Add KCP support (fixes #804)

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3489

vendor/github.com/ccding/go-stun/stun/doc.go

@@ -0,0 +1,25 @@
+// Copyright 2013, Cong Ding. 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
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Author: Cong Ding <dinggnu@gmail.com>
+
+// Package stun is a STUN (RFC 3489 and RFC 5389) client implementation in
+// golang.
+//
+// It is extremely easy to use -- just one line of code.
+//
+// 	nat, host, err := stun.NewClient().Discover()
+//
+// More details please go to `main.go`.
+package stun