List v3 instead of v2 onion addresses in README

Onion services v2 are deprecated and will stop working entirely in the
not too distant future according to the public timeline of the Tor
Project: https://blog.torproject.org/v2-deprecation-timeline

We entirely missed the party though… but we can at least mention the v3
addresses in the README now, so that users have one more source of
truth in a place they are likely to consult if the old addresses stop
working for them.

Closes: #990002

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