Call .stop() on the event loop when the asyncio REPL exits

Author: johnslavik

Lib/asyncio/__main__.py

@@ -239,5 +239,6 @@ def interrupt(self) -> None:
         else:
             break
 
+    loop.close()
     console.write('exiting asyncio REPL...\n')
     sys.exit(return_code)