Dataknead

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* Spiffy new website using Sphinx and the `Furo theme <https://github.com/pradyunsg/furo>`_.
* Upgraded dependencies, ``dataknead`` now requires Python 3.6.1 or higher
* Added a TOML loader.
* Completely rewrote the Excel loader so we can remove the depedency on ``pandas``. Removed support for the legacy ``xls`` format, only ``xlsx`` is supported. This fixes 14.

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* Breaking change: removed the ``query`` method: the focus of ``dataknead`` is on conversion. Using ``apply`` you can easily use a tool like ``jq`` to query.

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* Adding tuple shortcut to ``map`` (2)
* Adding support for ``txt`` files ((4)
* Adding support for loader constructor argument passing, and adding a ``has_header`` option to ``CsvLoader`` (5)

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Initial release