v0.2.3

Fixed

• devalerts dashboard no longer crashes with UnicodeEncodeError on
  consoles using a legacy codepage (e.g. cp1251) when a group's backoff
  multiplier is shown — the × suffix (limited ×2) now falls back to
  x2 like the dashboard's other unicode characters already did.

Added

• README: demo GIF showing setup, the dashboard, mute, and a real alert
  landing in Telegram with the collapsed traceback.