npf.io/deputy is not accessible

[liuxingjun]

How to reproduce it

$ mkdir testmod
$ go mod init testmod
go: creating new go.mod: module testmod
$ cat >> main.go <<EOF
package main

import (
	"fmt"
	"github.com/natefinch/deputy"
)
func main() {
	fmt.Println(deputy.DefaultErrs)
}
EOF
$ go mod tidy
go: finding module for package npf.io/deputy
testmod imports
        github.com/natefinch/deputy tested by
        github.com/natefinch/deputy.test imports
        npf.io/deputy: cannot find module providing package npf.io/deputy: unrecognized import path "npf.io/deputy": reading https://npf.io/deputy?go-get=1: 404 Not Found

deputy/example_test.go

Line 8 in 5e10e7d

"npf.io/deputy"