v0.12.1

Fixed

• The daemon fetches the senders that cached messages name but the cache lacks, so
  sender:name finds their messages and tg messages shows their names. Caches synced before
  0.9.0 have many (about 3% of the messages of a 1.16M-message cache), and a live message still
  leaves one now and then. Once a day the daemon asks Telegram for one message of each such
  sender by ID, up to 100 per request, only when it has no other sync work: on a made-up cache of
  that shape, 349 requests for 2,960 senders. A sender Telegram doesn't return is asked again
  30 days later. tg status shows how many senders are still missing (#143).