v0.26.4

A Worker with nothing to do with Track could use up the sign-in limits of every other Worker. Updating a self-hosted
copy needs no migration and no new setting, and the protocol stays at version 25. (#201)

Fixed

• One Worker could use up what another needs. Every Worker on Cloudflare reaches Track from one address, so
  Track's sign-in limits counted them all as one caller, and enough junk from any of them could stop a provider's
  logout reaching Track. A Worker is now counted by its zone, which Cloudflare sets and a sender cannot change. Anyone
  else is counted by their address as before, whatever they claim. (#201)