Fix test_can_save_request (tests.unit.test_reviewer.TestReview

[ricardodani]

Traceback (most recent call last):
File "/Users/ricardo.dani/Development/holmes-api/tests/unit/test_reviewer.py", line 383, in test_can_save_request
dumps({'url': url, 'type': 'new-request'})
File "/Users/ricardo.dani/Development/holmes-api/.tox/py27/lib/python2.7/site-packages/mock.py", line 846, in assert_called_once_with
return self.assert_called_with(_args, *_kwargs)
File "/Users/ricardo.dani/Development/holmes-api/.tox/py27/lib/python2.7/site-packages/mock.py", line 835, in assert_called_with
raise AssertionError(msg)
AssertionError: Expected call: mock('{"url":"http://t.com/robots.txt","type":"new-request"}')
Actual call: mock('{"type":"new-request","url":"http://t.com/robots.txt"}')