Products-btreefolder2

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- Nothing changed yet.

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- Add support for Python 3.9

- Modernize the ZMI template to match the Zope 4 styles
(`10 <https://github.com/zopefoundation/Products.BTreeFolder2/issues/10>`_)

- Add ``Delete All Objects`` button to the manage screen.
(`9 <https://github.com/zopefoundation/Products.BTreeFolder2/issues/9>`_)

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

- Drop support for Python 3.4 since Zope itself does not support it.

- Add support for Python 3.8

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- More PEP8 compliance.

- Add icon for Bootstrap ZMI.

- Avoid deprecation warnings by using current API.

- Add support for Python 3.7.

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- added tox configuration

- Python 3 compatibility

- Update to require and be compatible with Zope 4.

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- Update Dependencies (no ZODB, but BTrees)