missing "closed_by" data in response for single issue request

[lbrader]

https://github.com/octokit/octokit.net/blob/master/docs/issues.md

I'm retrieving a list of issues from a repository and if it's close I retrieve the single issue. The issue value returned from the single issue response - does not contain "Close_by" fields.

var issue = await client.Issue.Get("octokit", "octokit.net",#_of_issue);

The "issue" response is incorrect.

Reference https://developer.github.com/v3/issues/#get-a-single-issue for the expected JSON response format. Inside the response the "closed_by" value is expected - doesn't exist.
{
// removed for clarity
"closed_by": {
"login": "octocat",
"id": 1,
"avatar_url": "https://github.com/images/error/octocat_happy.gif",
"gravatar_id": "",
"url": "https://api.github.com/users/octocat",
"html_url": "https://github.com/octocat",
"followers_url": "https://api.github.com/users/octocat/followers",
"following_url": "https://api.github.com/users/octocat/following{/other_user}",
"gists_url": "https://api.github.com/users/octocat/gists{/gist_id}",
"starred_url": "https://api.github.com/users/octocat/starred{/owner}{/repo}",
"subscriptions_url": "https://api.github.com/users/octocat/subscriptions",
"organizations_url": "https://api.github.com/users/octocat/orgs",
"repos_url": "https://api.github.com/users/octocat/repos",
"events_url": "https://api.github.com/users/octocat/events{/privacy}",
"received_events_url": "https://api.github.com/users/octocat/received_events",
"type": "User",
"site_admin": false
}

[ryangribble]

duplicate of #1350