Go, print numbers with thousand separators

main.go

package main

import (
	"golang.org/x/text/language"
	"golang.org/x/text/message"
)

// create a new printer withe the locale set to english
var print = message.NewPrinter(language.English)

func main() {
	print.Printf("Num of docs: %d\n", 100000000)
}