Fix: unclosed event loop (#176)

Author: hjk1030

aidb/utils/asyncio.py

@@ -8,7 +8,9 @@ def asyncio_run(future, as_task=True):
     loop = asyncio.get_running_loop()
   except RuntimeError:  # no event loop running
     loop = asyncio.new_event_loop()
-    return loop.run_until_complete(_to_task(future, as_task, loop))
+    ret = loop.run_until_complete(_to_task(future, as_task, loop))
+    loop.close()
+    return ret
   else:
     nest_asyncio.apply(loop)
     return asyncio.run(_to_task(future, as_task, loop))