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function clean() has direction/var ordering but was called in plot_windrose_np() as var/direction. Reference https://github.com/python-windrose/windrose/issues/155

Docs simplify map overlay

fix typo in docs for map overlay

fix travis build

* add new python version test for travis.yml

* bump version to 1.6.8

* fix missing travis test for python 3.7 and 3.8

* remove empty Notebook

* maj changelog

* add missing issue to changelog
Co-authored-by: Samuel <[email protected]>

* add tests forlders to gitignore

* add png in tests forlder to gitignore

* close figure after save (fix #109)

* do not force the size of the ax bbox in from_ax

* add example on map overlay + screenshot

* fix copy/paste typo + delete unused code in doc

* custom units in legend

* custom theta_labels

* [FIX #117]: deprecated, replace _autogen_docstring by doctring.copy

* update changelog

misplaced comma resulted in SyntaxError

* Update README.md

* Add calm limit parameter and representative circle

* PEP8

* Address style issues in setup.py

* Address style issues in windrose.py

* Do not use opening parens for raising exceptions

* Do not use 'o' as a variable name

Closes #99