Wrong tests? Quality should be 4 instead of 2

Hello,

I do have a little question... In the tests we have to enable, are you sure about the quality value?

[Wrong value](https://github.com/matthewmorgan/gilded-rose-python-with-tests/blob/d65d448243b88e541986f5ac76b6e1cf53431237/gilded_rose_test.py#L112)

Shouldn't it be 4, instead of 2?
`expected = {'sell_in': 2, 'quality': 4}`

Kr,
Oele Geirnaert