Chartify

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* Reduce dependencies by switching from Jupyter to IPython.

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* Updated Python to 3.6+ and Pandas to 1.0+ (Thanks tomasaschan!)
* Updated Bokeh to 2.0+
* Removed colour dependency to fix setup errors.

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Bugfixes:

* Updated default yaml loader to move off of
deprecated method (Thanks vh920!)
* Updated legend handling to adjust for deprecated methods
in recent versions of Bokeh (Thanks for reporting jpkoc)
* Updated license in setup.py (Thanks for reporting jsignell)
* Bump base Pillow dependency to avoid insecure version.
* Update MANIFEST to include missing files (Thanks toddrme2178!)

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Bugfixes:

* Moved package requirements and fixed bug that occured with
latest version of Bokeh (Thanks emschuch & mollymzhu!)
* Fixed bug in README while generating docs (Thanks Bharat123rox!)

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Improvements:

* Allows users to plot colors on bar charts that aren't contained in the
categorical axis.


Bugfixes:

* Fixed bug that caused float types to break when plotted with categorical
text plots (Thanks for finding danela!)
* Fixed broken readme links.

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Improvements:

* Added Radar Chart