circleci.go
func (c *Client) DeleteCheckoutKey(account, repo, fingerprint string) error {
	return c.request("DELETE", fmt.Sprintf("project/%s/%s/checkout-key/%s", account, repo, fingerprint), nil, nil, nil)
}
func (c *Client) DeleteCheckoutKey(account, repo, fingerprint string) error {
	return c.request("DELETE", fmt.Sprintf("project/%s/%s/checkout-key/%s", account, repo, fingerprint), nil, nil, nil)
}
// DeleteCheckoutKey fetches the checkout key for the given project by fingerprint