Revert "check the python requirements for the gaiohttp server"

This reverts commit 4ac7e55161553503817dfbd01ccc5f263d163e69.

docs/source/news.rst

@@ -9,7 +9,6 @@ Changes
 Core
 ++++
 
-- improvement: fix #788 check the python requirements for the gaiohttp server
 - fix #785: handle binary type address given to a client socket address
 - fix graceful shutdown. make sure QUIT and TERMS signals are switched
   everywhere.

gunicorn/workers/gaiohttp.py

@@ -7,12 +7,7 @@ __all__ = ['AiohttpWorker']
 import asyncio
 import functools
 import os
-import sys
-
-from . import base
-
-if sys.version_info < (3, 3, 0):
-    raise RuntimeError("Python 3.3 and later is needed to run this worker")
+import gunicorn.workers.base as base
 
 try:
     from aiohttp.wsgi import WSGIServerHttpProtocol