func (c *Client) CreatePullRequest(org, repo, title, body, head, base string, canModify bool) (int, error) {
	c.log("CreatePullRequest", org, repo, title)
	data := struct {
		Title string `json:"title"`
		Body  string `json:"body"`
		Head  string `json:"head"`
		Base  string `json:"base"`
		// MaintainerCanModify allows maintainers of the repo to modify this
		// pull request, eg. push changes to it before merging.
		MaintainerCanModify bool `json:"maintainer_can_modify"`
	}{
		Title: title,
		Body:  body,
		Head:  head,
		Base:  base,

		MaintainerCanModify: canModify,
	}
	var resp struct {
		Num int `json:"number"`
	}
	_, 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.MethodPost,
		path:        fmt.Sprintf("/repos/%s/%s/pulls", org, repo),
		requestBody: &data,
		exitCodes:   []int{201},
	}, &resp)
	if err != nil {
		return 0, err
	}
	return resp.Num, nil
}
func (c *Client) CreatePullRequest(org, repo, title, body, head, base string, canModify bool) (int, error) {
	c.log("CreatePullRequest", org, repo, title)
	data := struct {
		Title string `json:"title"`
		Body  string `json:"body"`
		Head  string `json:"head"`
		Base  string `json:"base"`
		// MaintainerCanModify allows maintainers of the repo to modify this
		// pull request, eg. push changes to it before merging.
		MaintainerCanModify bool `json:"maintainer_can_modify"`
	}{
		Title: title,
		Body:  body,
		Head:  head,
		Base:  base,

		MaintainerCanModify: canModify,
	}
	var resp struct {
		Num int `json:"number"`
	}
	_, 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.MethodPost,
		path:        fmt.Sprintf("/repos/%s/%s/pulls", org, repo),
		requestBody: &data,
		exitCodes:   []int{201},
	}, &resp)
	if err != nil {
		return 0, err
	}
	return resp.Num, nil
}
// CreatePullRequest creates a new pull request and returns its number if
// the creation is successful, otherwise any error that is encountered.
//
// See https://developer.github.com/v3/pulls/#create-a-pull-request