How to get PullRequest object

gistfile1.txt

'use strict';

var GitHubApi = require('github'),
    Promise      = require('bluebird'),
    sprintf   = require('sprintf');

var github = new GitHubApi({
    version: '3.0.0',
    protocol: 'https',
});

github.authenticate({
    type: 'oauth',
    token: 'SECRET-TOKEN',
});

var ghprget = Promise.promisify(
    github.pullRequests.get, GitHubApi
);

ghprget({
    user: 'kouzoh',
    repo: 'SOMETHING-REPO-NAME',
    number: 1
}).then(function(pr) {
    console.log(pr);
});