Products.sessions

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- add badges to the README

- add additional links on PyPI

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- improve flake8 compliance

- Implement ``__contains__`` on ``TransientObject``
(`21 <https://github.com/zopefoundation/Products.Sessions/issues/21>`_)

- Fix session data manager edit form

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- Fix ``NameError`` in ``Products/Transience/Transience.py`` introduced in
version 4.3.

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- Fix HTML of ``manageDataManager.dtml``.
(`22 <https://github.com/zopefoundation/Products.Sessions/pull/22>`_)

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- Specify supported Python versions using ``python_requires`` in setup.py
(`Zope481 <https://github.com/zopefoundation/Zope/issues/481>`_)

- Add support for Python 3.8

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- Make sure ``TransientObjectContainer.getTimeoutMinutes`` returns ints.
(`17 <https://github.com/zopefoundation/Products.Sessions/issues/17>`_)

- Add ``tox``-based testing for unit tests, code coverage and linting.

- Fix ZMI layout.
(`19 <https://github.com/zopefoundation/Products.Sessions/pull/19>`_)