pushy.go
func (p *Pushy) DeleteNotification(pushID string) (*SimpleSuccess, *Error, error) {
	url := fmt.Sprintf("%s/pushes/%s?api_key=%s", p.APIEndpoint, pushID, p.APIToken)
	var success *SimpleSuccess
	var pushyErr *Error
	err := del(p.httpClient, url, &success, &pushyErr)
	return success, pushyErr, err
}
func (p *Pushy) DeleteNotification(pushID string) (*SimpleSuccess, *Error, error) {
	url := fmt.Sprintf("%s/pushes/%s?api_key=%s", p.APIEndpoint, pushID, p.APIToken)
	var success *SimpleSuccess
	var pushyErr *Error
	err := del(p.httpClient, url, &success, &pushyErr)
	return success, pushyErr, err
}
// DeleteNotification deletes a created notification