Z3c-checkversions

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- Nothing changed yet.

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- Add support for Python 3.8, drop support for Python 3.4.

- Improve error message in case zc.buildout is not installed.

- Improve installation instruction.

- Pass the index url to both the 'installed' and 'buildout' checkers.

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- Add support for Python 3.7.

- Drop support for `python setup.py test`.

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- Fix compatibility with setuptools 39 by using an API introduced
in setuptools 8. (`GH 8`_)

- Add support for Python 3.5, 3.6 and PyPy3.

- Drop support for Python 2.6 and 3.3.

- Standardize namespace ``__init__``.

.. _GH 8 : https://github.com/zopefoundation/z3c.checkversions/issues/8

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- Python 3 support by Nicolas Dietrich (`GH 2`_, `GH 4`_)

.. _GH 2: https://github.com/zopefoundation/z3c.checkversions/pull/2
.. _GH 4: https://github.com/zopefoundation/z3c.checkversions/pull/4

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- ignore installed packages while searching for new versions, only look in
the package index (makes the test suite more reliable, among other things).
- fix IndexError: list index out of range when buildout.cfg had a package with
a blank version pin.
- show updates for non-final package versions, if there's a newer non-final
version available on PyPI (`GH 1`_)

.. _GH 1: https://github.com/zopefoundation/z3c.checkversions/pull/1