func NewTransportWith(eng *stats.Engine, t http.RoundTripper) http.RoundTripper {
	return &transport{
		transport: t,
		eng:       eng,
	}
}
NewTransportWith wraps t to produce metrics on eng for every request sent and
every response received.
package httpstats
import (
	"net/http"
	"time"
	"github.com/segmentio/stats/v4"
)
func NewTransport(t http.RoundTripper) http.RoundTripper {
	return NewTransportWith(stats.DefaultEngine, t)
}