func Lookup(name string) *flag.Flag {
	return EnvironmentFlags.Lookup(name)
}
Lookup returns the Flag structure of the named environment flag,
returning nil if none exists.
package envflag
import (
	"flag"
	"fmt"
	"os"
	"strings"
	"time"
)
func VisitAll(fn func(*flag.Flag)) {
	EnvironmentFlags.VisitAll(fn)
}
func Visit(fn func(*flag.Flag)) {
	EnvironmentFlags.Visit(fn)
}