asyncio: sync with github asyncio

* queues: get coroutine from asyncio.coroutines, not from asyncio.tasks
* tets: replace tulip with asyncio in comments
diff --git a/Lib/asyncio/queues.py b/Lib/asyncio/queues.py
index ed11662..3b4dc21 100644
--- a/Lib/asyncio/queues.py
+++ b/Lib/asyncio/queues.py
@@ -9,7 +9,7 @@
 from . import events
 from . import futures
 from . import locks
-from .tasks import coroutine
+from .coroutines import coroutine
 
 
 class QueueEmpty(Exception):