add vendor & update README.md

vendor/github.com/gin-gonic/autotls/.editorconfig

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+# unifying the coding style for different editors and IDEs => editorconfig.org
+
+; indicate this is the root of the project
+root = true
+
+###########################################################
+; common
+###########################################################
+
+[*]
+charset = utf-8
+
+end_of_line = LF
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+indent_style = space
+indent_size = 2
+
+###########################################################
+; make
+###########################################################
+
+[Makefile]
+indent_style = tab
+
+[makefile]
+indent_style = tab
+
+###########################################################
+; markdown
+###########################################################
+
+[*.md]
+trim_trailing_whitespace = false
+
+###########################################################
+; golang
+###########################################################
+
+[*.go]
+indent_style = tab

vendor/github.com/gin-gonic/autotls/.gitignore

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+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof
+
+vendor/*
+!vendor/vendor.json

vendor/github.com/gin-gonic/autotls/.travis.yml

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+language: go
+sudo: false
+go:
+  - 1.6.x
+  - 1.7.x
+  - 1.8.x
+  - 1.9.x
+  - 1.10.x
+  - master
+
+git:
+  depth: 3
+
+install:
+  - go get -v github.com/kardianos/govendor
+  - govendor sync
+  - go get -u github.com/campoy/embedmd
+
+script:
+  - embedmd -d README.md
+
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/7f95bf605c4d356372f4
+    on_success: change  # options: [always|never|change] default: always
+    on_failure: always  # options: [always|never|change] default: always
+    on_start: false     # default: false

vendor/github.com/gin-gonic/autotls/LICENSE

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+MIT License
+
+Copyright (c) 2017 Gin-Gonic
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/gin-gonic/autotls/README.md

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+# autotls
+
+[![Build Status](https://travis-ci.org/gin-gonic/autotls.svg?branch=master)](https://travis-ci.org/gin-gonic/autotls) 
+[![Go Report Card](https://goreportcard.com/badge/github.com/gin-gonic/autotls)](https://goreportcard.com/report/github.com/gin-gonic/autotls)
+[![GoDoc](https://godoc.org/github.com/gin-gonic/autotls?status.svg)](https://godoc.org/github.com/gin-gonic/autotls)
+[![Join the chat at https://gitter.im/gin-gonic/autotls](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/gin-gonic/autotls?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
+Support Let's Encrypt for a Go server application.
+
+## example
+
+example for 1-line LetsEncrypt HTTPS servers.
+
+[embedmd]:# (example/example1.go go)
+```go
+package main
+
+import (
+	"log"
+
+	"github.com/gin-gonic/autotls"
+	"github.com/gin-gonic/gin"
+)
+
+func main() {
+	r := gin.Default()
+
+	// Ping handler
+	r.GET("/ping", func(c *gin.Context) {
+		c.String(200, "pong")
+	})
+
+	log.Fatal(autotls.Run(r, "example1.com", "example2.com"))
+}
+```
+
+example for custom autocert manager.
+
+[embedmd]:# (example/example2.go go)
+```go
+package main
+
+import (
+	"log"
+
+	"github.com/gin-gonic/autotls"
+	"github.com/gin-gonic/gin"
+	"golang.org/x/crypto/acme/autocert"
+)
+
+func main() {
+	r := gin.Default()
+
+	// Ping handler
+	r.GET("/ping", func(c *gin.Context) {
+		c.String(200, "pong")
+	})
+
+	m := autocert.Manager{
+		Prompt:     autocert.AcceptTOS,
+		HostPolicy: autocert.HostWhitelist("example1.com", "example2.com"),
+		Cache:      autocert.DirCache("/var/www/.cache"),
+	}
+
+	log.Fatal(autotls.RunWithManager(r, &m))
+}
+```

vendor/github.com/gin-gonic/autotls/autotls.go

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+package autotls
+
+import (
+	"crypto/tls"
+	"net/http"
+
+	"golang.org/x/crypto/acme/autocert"
+)
+
+// Run support 1-line LetsEncrypt HTTPS servers
+func Run(r http.Handler, domain ...string) error {
+	return http.Serve(autocert.NewListener(domain...), r)
+}
+
+// RunWithManager support custom autocert manager
+func RunWithManager(r http.Handler, m *autocert.Manager) error {
+	s := &http.Server{
+		Addr:      ":https",
+		TLSConfig: &tls.Config{GetCertificate: m.GetCertificate},
+		Handler:   r,
+	}
+
+	go http.ListenAndServe(":http", m.HTTPHandler(nil))
+
+	return s.ListenAndServeTLS("", "")
+}

vendor/github.com/gin-gonic/autotls/doc.go

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+// Package autotls support Let's Encrypt for a Go server application.
+//
+// 	package main
+//
+// 	import (
+// 		"log"
+//
+// 		"github.com/gin-gonic/autotls"
+// 		"github.com/gin-gonic/gin"
+// 	)
+//
+// 	func main() {
+// 		r := gin.Default()
+//
+// 		// Ping handler
+// 		r.GET("/ping", func(c *gin.Context) {
+// 			c.String(200, "pong")
+// 		})
+//
+// 		log.Fatal(autotls.Run(r, "example1.com", "example2.com"))
+// 	}
+//
+package autotls