Close Tortoise connections properly

aerich/cli.py

@@ -36,6 +36,7 @@ def coro(f):
     def wrapper(*args, **kwargs):
         loop = asyncio.get_event_loop()
         loop.run_until_complete(f(*args, **kwargs))
+        loop.run_until_complete(Tortoise.close_connections())
 
     return wrapper