Fixes #285, broken download link

[flaviut]

Maven central updated their website and broke old links, adding a "classic" to the url fixes this link.

I assert that this patch is my own work, and to simplify the licensing of the BFG Repo-Cleaner:

• [ ] I assign the copyright on this contribution to Roberto Tyley
• [x] I disclaim copyright and thus place this contribution in the public domain