Z3c-macro

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- Nothing changed yet.

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- Fix list of supported Python versions in Trove classifiers: The currently
supported Python versions are 2.7, 3.6, 3.7, PyPy2 and PyPy3.

- Flake8 the code.

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- Removed Python 3.5 support, added Python 3.7.

- Fixed up tests.

- Fix docstring that caused DeprecationWarning.

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- Drop support for Python 2.6 and 3.3.

- Add support for Python 3.4, 3.5 and 3.6.

- Add support for PyPy.

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- Standardize namespace ``__init__``.

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- Added support for Python 3.3.

- Replaced deprecated ``zope.interface.implements`` usage with equivalent
``zope.interface.implementer`` decorator.

- Dropped support for Python 2.4 and 2.5.