Avoid explicitly passing the loop to asyncio

This behaviour is deprecated and will be removed in future versions
of Python. Technically, it could be considered a bug (invalid usage
causing different behaviour from the expected one), and in practice
it should not break much code (because .get_event_loop() would likely
be the same event loop anyway).

telethon/requestiter.py

@@ -65,8 +65,7 @@ class RequestIter(abc.ABC):
             # asyncio will handle times <= 0 to sleep 0 seconds
             if self.wait_time:
                 await asyncio.sleep(
-                    self.wait_time - (time.time() - self.last_load),
-                    loop=self.client.loop
+                    self.wait_time - (time.time() - self.last_load)
                 )
                 self.last_load = time.time()