#211 breaks commands that use PassAfterNonOption

[chipaca]

With the change introduced by #211 any parser that uses commands can no longer use flags.PassAfterNonOption. I believe this is a bug, and I'll be working on a fix—please let me know if it's intended behaviour so I can leave it be (and instead change our code).

As an example, this:

package main

import (
	"github.com/jessevdk/go-flags"
)

type options struct {
	Foo struct{} `command:"foo"`
}

func main() {
	parser := flags.NewParser(&options{}, flags.PassAfterNonOption)
	if _, err := parser.Parse(); err != nil {
		println("***", err.Error())
	}
}

produces

$ go run /tmp/q.go foo
*** Unknown command `foo', did you mean `foo'?