[tor-relays] tor 0.2.8.x: in 26 days to the top

~26 days after the first stable tor 0.2.8.x release, it has become the most prevalent tor version on the network by consensus weight [1]. There are still more 0.2.7.x relays than 0.2.8.x relays on the network [2], but that will change soon. [1] https://github.com/ornetstats/stats/blob/9f63665a7a4bc996f224006e76b1c7cf4eb... [2] https://metrics.torproject.org/versions.html