Ignore gevent tests on less than Python 3.6

Author: SmileyChris

tests/conftest.py

@@ -2,5 +2,7 @@
 
 if sys.version_info > (3,):
     collect_ignore = ["test_django_channels.py"]
+    if sys.version_info < (3, 6):
+        collect_ignore.append('test_gevent.py')
 else:
     collect_ignore = ["test_aiohttp.py"]