Unable to Create Webhook for Jenkins

```
var GitHub = require('github-api');
var Promise = require("es6-promise").Promise;

const gh = new GitHub({
username: 'foo',
password: 'bar'
});

var fork = gh.getRepo('user', 'repo');
console.log(fork);

var hookDef = {
"name" : "web",
"config" : {
"url" : "http://jenkinshost:8080",
"content_type": "json"
},
"events" : ["push"],
"active" : true
}
fork.createHook(hookDef)
.then(function(data) {
console.log("A jenkins hook has been created which will trigger a build on push and pull request events...");
});
```

Is there something I am missing

Start by reproducing the JavaScript example and inspect the result or error from fork.createHook(hookDef). Check whether the supplied webhook definition is accepted, then confirm that a Jenkins webhook can be created successfully for the repository.

索引モデルが issue の本文から書いたものです。