This change adds the updated warrant canary for 20180701 including
adding signatures and the public key for Kyle Rankin. This will also be
the first change in the transition to
https://source.puri.sm/Purism/warrant-canary
as the source for the Purism warrant canary instead of
https://github.com/purism/warrant-canary
For the time being the warrant canary will be available and up to date
on both repositories.