0.3.4 nested struct, struct starts with lowercase, cannot copy

[binbin0325]

Reproducible Example

code
`package main

import (
"fmt"
"github.com/jinzhu/copier"
)

type baseUser struct {
Id int
Name string
}

type User struct {
baseUser
Name string
}

type Employee struct {
baseUser
// Tell copier.Copy to panic if this field is not copied.
Name string copier:"must"
}

func main() {
b := baseUser{Id: 11}
var (
user = User{baseUser: b, Name: "Jinzhu"}
employee = Employee{Name: "zzz"}
)

copier.Copy(&employee, &user)

fmt.Printf("%#v \n", employee)

}
`

Description

0.3.4 nested struct, struct starts with lowercase, cannot copy

version:0.3.4
output: main.Employee{baseUser:main.baseUser{Id:0, Name:""}, Name:"Jinzhu"}

version:0.3.2
output: main.Employee{baseUser:main.baseUser{Id:11, Name:""}, Name:"Jinzhu"}