add missing await

Author: sleepyStick

test/asynchronous/test_csot.py

@@ -103,7 +103,7 @@ async def test_change_stream_can_resume_after_timeouts(self):
                 await stream.try_next()
             await coll.insert_one({})
             with pymongo.timeout(10):
-                self.assertTrue(stream.next())
+                self.assertTrue(await stream.next())
             self.assertTrue(stream.alive)
             # Timeout applies to entire next() call, not only individual commands.
             with pymongo.timeout(0.5):