boilerplate tests and patch()

[derbexuk]

First off thanks for the app, it's been a great help in getting my project started. I am now running the boilerplate tests again, and am having trouble with the patch() call used in several of the tests, the error below comes from test_password_reset :

'''
with patch('boilerplate.lib.captcha.submit', return_value=captcha.RecaptchaResponse(is_valid=False)):
TypeError: patch() got an unexpected keyword argument 'return_value'
'''
looking at the skimpy documentation for webtest patch doesn't take an argument called return_value : https://webtest.readthedocs.org/en/latest/api.html