Updated README.

README.md

@@ -7,6 +7,7 @@ A simple, minimalistic ActivityPub instance
 - Lightweight, minimal dependencies
 - Extensive support of ActivityPub operations, e.g. write public notes, follow users, be followed, reply to the notes of others, admire wonderful content (like or boost), write private messages...
 - Simple but effective web interface
+- Multiuser
 - Easily-accessed MUTE button to silence morons
 - Tested interoperability with related software
 - No database needed