fix the vendor files

vendor/github.com/mozillazg/go-httpheader/README.md

@@ -0,0 +1,63 @@
+# go-httpheader
+
+go-httpheader is a Go library for encoding structs into Header fields.
+
+[![Build Status](https://img.shields.io/travis/mozillazg/go-httpheader/master.svg)](https://travis-ci.org/mozillazg/go-httpheader)
+[![Coverage Status](https://img.shields.io/coveralls/mozillazg/go-httpheader/master.svg)](https://coveralls.io/r/mozillazg/go-httpheader?branch=master)
+[![Go Report Card](https://goreportcard.com/badge/github.com/mozillazg/go-httpheader)](https://goreportcard.com/report/github.com/mozillazg/go-httpheader)
+[![GoDoc](https://godoc.org/github.com/mozillazg/go-httpheader?status.svg)](https://godoc.org/github.com/mozillazg/go-httpheader)
+
+## install
+
+`go get -u github.com/mozillazg/go-httpheader`
+
+
+## usage
+
+```go
+package main
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/mozillazg/go-httpheader"
+)
+
+type Options struct {
+	hide         string
+	ContentType  string `header:"Content-Type"`
+	Length       int
+	XArray       []string `header:"X-Array"`
+	TestHide     string   `header:"-"`
+	IgnoreEmpty  string   `header:"X-Empty,omitempty"`
+	IgnoreEmptyN string   `header:"X-Empty-N,omitempty"`
+	CustomHeader http.Header
+}
+
+func main() {
+	opt := Options{
+		hide:         "hide",
+		ContentType:  "application/json",
+		Length:       2,
+		XArray:       []string{"test1", "test2"},
+		TestHide:     "hide",
+		IgnoreEmptyN: "n",
+		CustomHeader: http.Header{
+			"X-Test-1": []string{"233"},
+			"X-Test-2": []string{"666"},
+		},
+	}
+	h, _ := httpheader.Header(opt)
+	fmt.Printf("%#v", h)
+	// h:
+	// http.Header{
+	//	"X-Test-1":     []string{"233"},
+	//	"X-Test-2":     []string{"666"},
+	//	"Content-Type": []string{"application/json"},
+	//	"Length":       []string{"2"},
+	//	"X-Array":      []string{"test1", "test2"},
+	//	"X-Empty-N":    []string{"n"},
+	//}
+}
+```