Pytest-remove-stale-bytecode

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- Add support for Python 3.6, PyPy2 and PyPy3.

- Do not show output by default anymore. It can be turned on with ``-v``
option.

- Change the license from ZPL to MIT.

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- Also remove bytecode files under Python 3, that end with ``-PYTEST``.

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- Add support for removing byte code files under Python 3.

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- initial release