I used example clone.js , but i got such error ``` clone.on("status", function(bytes, total, done) { ^ TypeError: Cannot call method 'on' of undefined ``` the source code of clone method is like that https://github.com/libgit2/node-gitteh/blob/master/lib/gitteh.js#L75-L77 how can I clone a repo by https url or git url?