prow/github/client.go
func (c *Client) EditRepoHook(org, repo string, id int, req HookRequest) error {
	c.log("EditRepoHook", org, repo, id)
	return c.editHook(org, &repo, id, req)
}
func (c *Client) EditRepoHook(org, repo string, id int, req HookRequest) error {
	c.log("EditRepoHook", org, repo, id)
	return c.editHook(org, &repo, id, req)
}
// EditRepoHook updates an existing hook with new info (events/url/secret)
// https://developer.github.com/v3/repos/hooks/#edit-a-hook