Gocept-country

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- Drop support for Python 3.5.

- Use Github actions as CI.

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- Add support for Python 3.5 up to 3.8, PyPy and PyPy3.

- Replace test dependency on `zope.app.testing` by `zope.app.wsgi[testlayer]`.

- Migrate to Github.

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- Update to ``pycountry >= 16.x``.

- Drop support for Python 2.6.

- Bring test coverage to 100 %.

- Change testrunner to py.test.

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- Update to ``pycountry 1.12`` thus adding support for ISO 639 3, dropping the
old ISO 639 support.

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- Move repos to https://bitbucket.org/gocept/gocept.country

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- Bugfix: declared namespace package in setup.py