Internet2 isn't considered a trusted issuer meaning that https links to
rit.edu will fail.
The host mirror.csclub.uwaterloo.ca has a trusted SSL cert and peering
is good so it can replace rit.edu without performance issues.
Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>
[Jo-Philipp Wich: rewrapped commit message]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>