Log Message:
Update to 0.5.2

Upstream changes:

0.5.2 - 2016-07-31

    When opening files ourselves, make sure we always name the file variable

0.5.1 - 2016-07-28

    Set default maximum complexity to -1 on the class itself

0.5.0 - 2016-05-30

    PyCon 2016 PDX release
    Add support for Flake8 3.0

0.4.0 - 2016-01-27

    Stop testing on Python 3.2
    Add support for async/await keywords on Python 3.5 from PEP 0492