replace windows newline character in Go : Trying to replace windows line ending using strings.Replace

    package main

    import (
	    "fmt"
	    "strings"
    )

    var hw string = "hello\r\nworld"

    func main() {
    	fmt.Println(hw)
	    strings.Replace(hw, "\r\n", " ", -1)
	    fmt.Println(hw)
    }

I suppose it is something very simple I am missing but not sure why the above does not work