Create closed issues as closed.

gh2gogs.js

@@ -42,6 +42,7 @@ function postIssue (issues) {
         body: {
             title: issue.title,
             body: `Originally at ${issue.created_at} by ${username}${issue.closed_at ? ` closed at ${issue.closed_at}` : ""}${issue.type === "pull_request" ? " (pull request)" : ""}\r\n\r\n${issue.body}`,
+            closed: !!issue.closed_at,
             labels: [] //issue.labels.map(each => each.split('/').pop())
         }
     }, (err, res, body) => {