Collection responses have an extra empty map as the last element

Is there a reason for responses returning a collection of github objects to include an empty element at the end or is that a bug?

```
(pulls/pulls "Raynes" "tentacles" {:auth "cddr:M24thbdinF"
                                                     :per-page 1})
=> [{:created_at "", :assignee nil.....} {}]
```

Would you accept a PR fixing it or would that be considered a breaking change?
