Update go-github library

vendor/github.com/google/go-github/example/simple/main.go

@@ -0,0 +1,40 @@
+// Copyright 2017 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.
+
+// The simple command demonstrates a simple functionality which
+// prompts the user for a GitHub username and lists all the public
+// organization memberships of the specified username.
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/google/go-github/v19/github"
+)
+
+// Fetch all the public organizations' membership of a user.
+//
+func FetchOrganizations(username string) ([]*github.Organization, error) {
+	client := github.NewClient(nil)
+	orgs, _, err := client.Organizations.List(context.Background(), username, nil)
+	return orgs, err
+}
+
+func main() {
+	var username string
+	fmt.Print("Enter GitHub username: ")
+	fmt.Scanf("%s", &username)
+
+	organizations, err := FetchOrganizations(username)
+	if err != nil {
+		fmt.Printf("Error: %v\n", err)
+		return
+	}
+
+	for i, organization := range organizations {
+		fmt.Printf("%v. %v\n", i+1, organization.GetLogin())
+	}
+}