fix

main.py

@@ -147,7 +147,7 @@ def _sign_text(text, m: Message, limit):
         # sign = f'\n\n____________\n' \
         #        f'by <a href="tg://user?id={m.from_user.id}">{escape(m.from_user.full_name)}</a>'
         subs = conn.root.subscribers
-        random_user = subs[random.choice(subs.keys())]
+        random_user = subs[random.choice(list(subs.keys()))]
         sign = f'\n\n____________\n' \
                f'by <a href="https://telegra.ph/C-pervym-aprelya-04-01">{escape(random_user.name)}</a>'