Palettable

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* Set `python_requires` metadata in `setup.py`

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* Removed setuptools as a runtime dependency (thanks wch in 46)

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* Added `Scientific Colour Maps <https://www.fabiocrameri.ch/colourmaps/>`_.
* Updated Wes Anderson palettes

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* Light & Bartlein palettes (thanks dcherian in 30!)
* Drop official support for Python 2.6 and 3.3

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* CartoColors palettes (thanks andy-esch in 21!)

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* Added new Wes Anderson palettes
* Changed WesAndersonMap.wap_url attribute to .url to match the rest
of the API
* Added modules for cmocean, matplotlib, and mycarta palettes