TypeError: request() got an unexpected keyword argument 'return_response' about grequests HOT 6 CLOSED

Python 2.7.3 (default, Aug  1 2012, 05:14:39) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import grequests
>>> urls = ["http://google.com", "http://github.com"]
>>> rs = (grequests.get(u) for u in urls)
>>> grequests.map(rs)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/grequests.py", line 79, in map
    requests = list(requests)
  File "<stdin>", line 1, in <genexpr>
  File "/usr/local/lib/python2.7/dist-packages/grequests.py", line 44, in wrapped
    return f(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/api.py", line 55, in get
    return request('get', url, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/api.py", line 44, in request
    return session.request(method=method, url=url, **kwargs)
TypeError: request() got an unexpected keyword argument 'return_response'
>>>