func (c *Client) GetPullRequest(org, repo string, number int) (*PullRequest, error) {
	c.log("GetPullRequest", org, repo, number)
	var pr PullRequest
	_, err := c.request(&request{
		// allow the description and draft fields
		// https://developer.github.com/changes/2018-02-22-label-description-search-preview/
		// https://developer.github.com/changes/2019-02-14-draft-pull-requests/
		accept:    "application/vnd.github.symmetra-preview+json, application/vnd.github.shadow-cat-preview",
		method:    http.MethodGet,
		path:      fmt.Sprintf("/repos/%s/%s/pulls/%d", org, repo, number),
		exitCodes: []int{200},
	}, &pr)
	return &pr, err
}
func (c *Client) GetPullRequest(org, repo string, number int) (*PullRequest, error) {
	c.log("GetPullRequest", org, repo, number)
	var pr PullRequest
	_, err := c.request(&request{
		// allow the description and draft fields
		// https://developer.github.com/changes/2018-02-22-label-description-search-preview/
		// https://developer.github.com/changes/2019-02-14-draft-pull-requests/
		accept:    "application/vnd.github.symmetra-preview+json, application/vnd.github.shadow-cat-preview",
		method:    http.MethodGet,
		path:      fmt.Sprintf("/repos/%s/%s/pulls/%d", org, repo, number),
		exitCodes: []int{200},
	}, &pr)
	return &pr, err
}
// GetPullRequest gets a pull request.
//
// See https://developer.github.com/v3/pulls/#get-a-single-pull-request