I need to fetch all comments (>50) in an issue, but I don't know how to pass params like ```js { per_page: 100, page: 2 } ``` to [`listIssueComments`](https://github.com/michael/github/blob/master/lib/Issue.js#L65). I also find that there is a method called `_requestAllPages`, but only applied to [`listIssues`](https://github.com/michael/github/blob/master/lib/Issue.js#L43). Is is better to add options params or use `_requestAllPages` in `listIssueComments`? Thanks a lot.