Updated PERLBREWURL to reflect Github API Changes

The old URL was not longer working and should be updated to reflect the github API changes noted here:
https://developer.github.com/changes/2014-04-25-user-content-security/

I kept getting `curl: (22) The requested URL returned error: 400 Bad Request` errors with the current install file and noticed a redirect to a new domain.  Updating the URL seemed to fix these errors.