Zope.contenttype

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- Add support for Python 3.6.

- Drop support for Python 3.3.

- Host documentation at https://zopecontenttype.readthedocs.io

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- Add support for Python 3.5.

- Drop support for Python 2.6.

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- Add support for Python 3.4 and PyPy3.

- Add support for testing on Travis.

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- Change the file contents argument of ``guess_content_type`` from string
to bytes. This change has no effect on Python 2.

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- Add some tests for better coverage.

- Add ``tox.ini`` and manifest.

- Add support for Python 3.3 and PyPy.

- Drop support for Python 2.4 and 2.5.

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- Properly restore the HTML snippet detection, by looking at the entire string
and not just its start.