Update-dotdee

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This is a "maintenance release" that updates Python compatibility:

- Python 3.7 and 3.8 are now officially supported.
- Python 2.6 and 3.4 are no longer supported.

Lots of miscellaneous changes sneaked in, no real code changes though:

- Changed the readme to use console highlighting.
- Documentation improvements, added this changelog.
- Fixed :pypi:`humanfriendly` 8 deprecation warnings.
- Changed makefile to use Python 3 for local development.
- Added ``license=MIT`` and ``python_requires`` to setup script.

.. _Release 6.0: https://github.com/xolox/python-update-dotdee/compare/5.0...6.0

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Add support for ``*.ini`` configuration file loading, for details refer to the
new :class:`.ConfigLoader` class.

.. _Release 5.0: https://github.com/xolox/python-update-dotdee/compare/4.0...5.0

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Merged `pull request 2`_ adding the ability to execute files and use their output.

.. _Release 4.0: https://github.com/xolox/python-update-dotdee/compare/3.0...4.0
.. _pull request 2: https://github.com/xolox/python-update-dotdee/pull/2

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Switch to :mod:`executor.contexts` to allow for remote execution.

.. _Release 3.0: https://github.com/xolox/python-update-dotdee/compare/2.0...3.0

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Cleaner Python API, separate command line interface.

Detailed changes:

- Refactor setup script, add wheel support.
- Refactor all the things! (Coveralls, Read the Docs, Travis CI, tox, pytest, a test suite, code style checks, ...).
- Separate command line interface from Python API.

.. _Release 2.0: https://github.com/xolox/python-update-dotdee/compare/1.1...2.0

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Merged `pull request 1`_ adding support for Python 3.

.. _Release 1.1: https://github.com/xolox/python-update-dotdee/compare/1.0.10...1.1
.. _pull request 1: https://github.com/xolox/python-update-dotdee/pull/1