Gocept-logging

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- Add an alias ``.warn`` for ``.warning`` for ``StaticDefaults``. (1)

- Drop support for Python 3.3 and declare compatibility with Python 3.6.

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- Fix `setup.py` to use relative paths.

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- Declare compatibility with PyPy and PyPy3.

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- Declare Python 3.5 compatibility.

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- Declare Python 3.4 compatibility.

- ``ArgumentParser.parse_args()`` now stores the computed log level on the
``log_level`` attribute of the return value.

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- Allow to change log format for the ``ArgumentParser``