coinbase.go
func (c Client) GenerateReceiveAddress(params *AddressParams) (string, error) {
	holder := map[string]interface{}{}
	if err := c.Post("account/generate_receive_address", params, &holder); err != nil {
		return "", err
	}
	return holder["address"].(string), nil
}
func (c Client) GenerateReceiveAddress(params *AddressParams) (string, error) {
	holder := map[string]interface{}{}
	if err := c.Post("account/generate_receive_address", params, &holder); err != nil {
		return "", err
	}
	return holder["address"].(string), nil
}
// GenerateReceiveAddress generates and returns a new bitcoin receive address