[Rivet] Rivet-2.6.0.tar.bz2 was substituted

[Dmitry Kalinkin]

Dear Rivet developers,

I've noticed that you have updated tarball at
http://www.hepforge.org/archive/rivet/Rivet-2.6.0.tar.bz2 . The new
tarball has some non-trivial differences to the old one. I think this
is a bad practice, there should have been a version bump. Sorry for
complaining, I just want to bring to your attention that some of your
users care about this.

Thank you,

Best regards,
Dmitry