Remove transfer_markers

Closes #104
Tests still pass - am I missing anything?

Author: Tadaboody

pytest_asyncio/plugin.py

@@ -6,7 +6,6 @@
 import socket
 
 import pytest
-from _pytest.python import transfer_markers
 
 try:
     from async_generator import isasyncgenfunction
@@ -36,7 +35,6 @@ def pytest_pycollect_makeitem(collector, name, obj):
         # Due to how pytest test collection works, module-level pytestmarks
         # are applied after the collection step. Since this is the collection
         # step, we look ourselves.
-        transfer_markers(obj, item.cls, item.module)
         item = pytest.Function(name, parent=collector)  # To reload keywords.
 
         if 'asyncio' in item.keywords: