code: function createIssue (client, repo, title, body, labels) {
    debug("createIssue", repo, title, body);
  
    return client.createIssue(_.merge(extractRepo(repo), {
      "title":  title,
      "body":   body,
      "labels": labels
    })).then(fromGithubIssue);
  }
docs: String, String, String, [String] ~→ Issue