Fix Python 3 compatibility

[jwygoda]

Otherwise, the build fails with an encoding error due to the default locale being ASCII on the Debian builders, not UTF-8. Regardless, this is the recommended approach for writing a setup.py which supports both Python 2 and Python 3.

Similar problem:
pytest-dev/pytest-mock#107

[mongkok]

Hi @adogyf,
Thanks for the PR and the reference :), please, fix the import order to merge.

import os
import re
from io import open

[jwygoda]

Thanks for the feedback. I've fixed the import order.

[codecov-io]

Codecov Report

Merging #21 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #21   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           7      7           
  Lines         150    150           
  Branches       15     15           
=====================================
  Hits          150    150

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