client.go
func NewClient(url string, tls bool, header interface{}) *Client {
	return &Client{
		url:    url,
		tls:    tls,
		header: header,
	}
}
func NewClient(url string, tls bool, header interface{}) *Client {
	return &Client{
		url:    url,
		tls:    tls,
		header: header,
	}
}
// NewClient return SOAP client