bug: not set region in NewClient funcion

[gao4263]

pkg/s3/client.go

need add : Region: client.Config.Region in this function

`func NewClient(cfg *Config) (*s3Client, error) {
var client = &s3Client{}

client.Config = cfg
u, err := url.Parse(client.Config.Endpoint)
if err != nil {
	return nil, err
}
ssl := u.Scheme == "https"
endpoint := u.Hostname()
if u.Port() != "" {
	endpoint = u.Hostname() + ":" + u.Port()
}
fmt.Fprintln(os.Stdout, endpoint)
minioClient, err := minio.New(endpoint, &minio.Options{
	Creds:        credentials.NewStaticV4(client.Config.AccessKeyID, client.Config.SecretAccessKey, ""),
	Region:       client.Config.Region,    // need add this 
	Secure:       ssl,
})
if err != nil {
	return nil, err
}
client.minio = minioClient
client.ctx = context.Background()
return client, nil

}`