missing @coroutine

Author: smurfix

tests/python/test_windows_events.py

@@ -57,6 +57,7 @@ def test_pipe(self):
         res = self.loop.run_until_complete(self._test_pipe())
         self.assertEqual(res, 'done')
 
+    @asyncio.coroutine
     def _test_pipe(self):
         ADDRESS = r'\\.\pipe\_test_pipe-%s' % os.getpid()