v0.9.3

What's new

• Auto-updates. The app checks for new versions, verifies each one's
  signature, and installs it. Settings › About has the controls, including an
  off switch and an optional Install beta versions toggle.
• One macOS build for both chips. The DMG is now universal — Intel Macs are
  supported again — and the app bundle is smaller than 0.9.1's despite covering
  two architectures.
• Emoji show up everywhere. They were drawn with the system font, so on
  Linux — which ships no emoji font — nothing appeared at all. Emoji now come
  from bundled artwork and look the same on every platform, in the picker,
  reactions, jumbo messages and verification.
• "Show in folder" works off macOS. Windows opens Explorer, Linux your file
  manager, each with its own wording.
• Sessions say which computer they are. New sign-ins register as
  "TeleMatrix Desktop: macOS" rather than a bare "TeleMatrix".