Fix for Hackage 2.0

On some Hackage content pages (e.g. [`transformers`](http://hackage.haskell.org/package/transformers)) there is a link titled `(info)`:

![hackage-info-link](https://cloud.githubusercontent.com/assets/124073/5541832/b41e0e0c-8ade-11e4-97a0-9c3fa4239f3c.png)

The link text `(info)` is incorrectly recognized as a version number, causing the current documentation being reported as outdated:

![hackage-fu-error](https://cloud.githubusercontent.com/assets/124073/5541878/6f6d454c-8adf-11e4-99fd-d3c435c7e8ef.png)

This pull request fixes this error.