bug: not set default for fields of a pointer struct field in an object.

[sdghchj]

version: 1.3.0

type Child struct {
	Name string `default:"Tom"`
	Age  int    `default:"20"`
}

type Parent struct {
	Child *Child
}

func TestPointerStructMember(t *testing.T) {
	m := Parent{Child: &Child{Name: "Jim"}}
	Set(&m)
	if m.Child.Age != 20 {
		t.Errorf("20 is expected")   //will fail here
	}
}