Remove unnecessary code

mirrortea/messengers/matrix.py

@@ -21,14 +21,3 @@ class Matrix:
 
     async def on_message(self, room, event):
         print(room, event, file=sys.stderr)
-
-    def upgrade_room(self, room, telegram_nickname):
-        event_dict = nio.event_builders.event_builder.EventBuilder(
-            name=telegram_nickname
-        ).as_dict()
-        client.room_send(
-            room_id=room,
-            message_type=event_dict["type"],
-            content=event_dict["content"],
-        )  # предположу что оно так работает
-        # https://matrix-nio.readthedocs.io/en/latest/nio.html#module-nio.event_builders.state_events