Fix asyncio.async/ensure_future warning

Author: hynek

README.rst

@@ -178,6 +178,7 @@ Changelog
 - The ``forbid_global_loop`` parameter has been removed.
 - Support for async and async gen fixtures has been added.
   `#45 <https://github.com/pytest-dev/pytest-asyncio/pull/45>`_
+- The deprecation warning regarding ``asyncio.async()`` has been fixed.
 
 0.5.0 (2016-09-07)
 ~~~~~~~~~~~~~~~~~~

pytest_asyncio/plugin.py

@@ -152,7 +152,8 @@ def pytest_pyfunc_call(pyfuncitem):
                         for arg in pyfuncitem._fixtureinfo.argnames}
 
             event_loop.run_until_complete(
-                asyncio.async(pyfuncitem.obj(**testargs), loop=event_loop))
+                asyncio.ensure_future(
+                    pyfuncitem.obj(**testargs), loop=event_loop))
             return True