Zope-exceptions

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- Nothing changed yet.

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- Add support for Python 3.6.

- Drop support for Python 3.3.

- Fix handling of unicode supplemental traceback information on
Python 2. Now such values are always encoded to UTF-8; previously
the results were undefined and depended on system encodings and the
values themselves. See `issue 1 <https://github.com/zopefoundation/zope.exceptions/issues/1>`_.

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- Drop support for Python 2.6 and 3.2.

- Make ``exceptionformatter.extract_stack`` signature comply with
``traceback.extract_stack``

- Add support for Python 3.5.

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- Fixes around ``TextExceptionFormatter`` ``limit``: ``formatException``
and ``extractStack`` was cutting the traceback at the bottom,
at the most interesting point. Now it will cut from the middle.
Some text about the missing entries will be inserted.

- Maybe fix for ``extractStack``, it did not detect recursions in the frames.

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- Added explicit support for Python 3.4.

- Updated ``boostrap.py`` to version 2.2.

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- Make sure that ``setup.py`` finds all tests. Now tox runs them all as well.

- Fix failing test under Python 3.

- Made buildout work under Python 3 and Buildout 2.