Remove extra argument from six.u function call

[delirious-lettuce]

It looks like six.u only takes one argument but it was being called with two.

text = six.u(text, 'utf-8')

six.u(text)

>>> import six
>>> text = 'test_str'
>>> six.u(text)
'test_str'
>>> six.u(text, 'utf-8')
Traceback (most recent call last):
  File "<input>", line 1, in <module>
TypeError: u() takes 1 positional argument but 2 were given

[eliangcs]

Nice catch, thanks!