0.27.0

• Logins follow your services account, not just your address. The bot now
  negotiates IRC capabilities, and where the network says who is identified to
  services it remembers that alongside the connection. A login is resumed by
  account first, which holds across a new address, a reconnect from anywhere,
  and a cloak applied a moment after joining. Nobody has to be registered:
  without an account the connection's nick!user@host works exactly as before.
• A vhost landing late no longer strands you. Services often apply a vhost
  after you have joined, which silently invalidated the address the bot had
  remembered - and nothing ever re-checked, so you stayed logged out until you
  logged in by hand. CHGHOST is now followed, and identifying after joining
  logs you straight in.
• When somebody the bot has seen play is not logged back in, it now says so
  in the log, with where they are and what it remembered. The miss used to be
  silent, which is indistinguishable from the bot being broken.
• Operators: capabilities are taken only if offered - account-notify,
  extended-join, chghost and multi-prefix - and a server that speaks no
  CAP at all registers exactly as it did before. One added column,
  platform_identity.login_account, applied on start like the others.