Meld3

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- No further development of the meld3 package is planned. The meld3 package
should be considered unmaintained as of April 2020. Since 2007, meld3
received only minimal updates to keep compatible with newer Python versions.
It was only maintained because it was a dependency of the Supervisor package.
Since Supervisor 4.1.0 (released in October 2019), the meld3 package is
no longer a dependency of Supervisor.

- Fixed a ``DeprecationWarning`` on Python 3.8.

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- Removed support for older Python versions. On Python 2, meld3 now
requires Python 2.7. On Python 3, meld3 now requires Python 3.4 or later.

- Added Python 3.7 classifier to ``setup.py``. No code changes were
needed for Python 3.7 compatibility.

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- Released to fix an issue where the universal wheel was tagged on PyPI
as Py Version "2.7" instead of "py2.py3".

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- Fixed a bug introduced in 1.0.0 where unicode strings could not be used
as attribute values. Thanks to Terrence Brannon for reporting the issue
and supplying the initial patch.

- A ``setup.cfg`` file has been added with a ``[bdist_wheel]`` section to
mark this package as a universal wheel.

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- Dropped support for Python 2.3 / 2.4. Users of those Python versions
should pin to earlier releases, (e.g., "meld3<1.0.0dev").

- Added compatibility with Python 3.2, 3.3, and 3.4. Thanks to Scott
Maxwell and Tres Seaver for contributing the patches.

- Installation now requires setuptools.

- The optional C extension has been removed. It was only used internally
by meld3, was not enabled by default, and did not support all meld3
features. The pure Python version has very acceptable performance.

- The license has been changed from ZPL 2.1 to the BSD-derived Repoze
license, which is the same license used by Supervisor.

- Profiling scripts that had been used early in meld3 development have
been removed.

- The example scripts example.py and melddiff.py have been removed. See
README.rst for the same example that was in example.py and the unit tests
for examples of the ``diffmeld`` function.

- Support for using meld3 directly from the command line with
``python meld3.py <file> <mutator>`` has been removed.

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- Fixed a bug where an exception could be raised when escaping certain
attribute or cdata values. This was caused by meld3 trying to use
_encode_entity from xml.etree without importing it first. Thanks to
Jorge Puente Sarrin for contributing the patch.