change rule and event handle

tests/test_plugins/test_metaevent.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from nonebot.rule import Rule
+from nonebot.event import Event
+from nonebot.plugin import on_metaevent
+
+
+def heartbeat(bot, event: Event) -> bool:
+    return event.detail_type == "heartbeat"
+
+
+test_matcher = on_metaevent(Rule(heartbeat))
+
+
+@test_matcher.handle()
+async def handle_heartbeat(bot, event: Event, state: dict):
+    print("[i] Heartbeat")