[Vendor] upgrade google/go-github to v32.1.0 (#12361)

* upgrate go-github client to v32.1.0

* migrate

vendor/github.com/google/go-github/v32/github/apps_manifest.go

@@ -0,0 +1,53 @@
+// Copyright 2019 The go-github AUTHORS. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import (
+	"context"
+	"fmt"
+)
+
+const (
+	mediaTypeAppManifestPreview = "application/vnd.github.fury-preview+json"
+)
+
+// AppConfig describes the configuration of a GitHub App.
+type AppConfig struct {
+	ID            *int64     `json:"id,omitempty"`
+	NodeID        *string    `json:"node_id,omitempty"`
+	Owner         *User      `json:"owner,omitempty"`
+	Name          *string    `json:"name,omitempty"`
+	Description   *string    `json:"description,omitempty"`
+	ExternalURL   *string    `json:"external_url,omitempty"`
+	HTMLURL       *string    `json:"html_url,omitempty"`
+	CreatedAt     *Timestamp `json:"created_at,omitempty"`
+	UpdatedAt     *Timestamp `json:"updated_at,omitempty"`
+	ClientID      *string    `json:"client_id,omitempty"`
+	ClientSecret  *string    `json:"client_secret,omitempty"`
+	WebhookSecret *string    `json:"webhook_secret,omitempty"`
+	PEM           *string    `json:"pem,omitempty"`
+}
+
+// CompleteAppManifest completes the App manifest handshake flow for the given
+// code.
+//
+// GitHub API docs: https://developer.github.com/v3/apps/#create-a-github-app-from-a-manifest
+func (s *AppsService) CompleteAppManifest(ctx context.Context, code string) (*AppConfig, *Response, error) {
+	u := fmt.Sprintf("app-manifests/%s/conversions", code)
+	req, err := s.client.NewRequest("POST", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	req.Header.Set("Accept", mediaTypeAppManifestPreview)
+
+	cfg := new(AppConfig)
+	resp, err := s.client.Do(ctx, req, cfg)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return cfg, resp, nil
+}