Py-ART Version 1.10.1 Impressionism

Version 1.10.1 is the result of a year of work by 16 contributors.
Thanks to all contributors, especially those who have made their first contribution to Py-ART.

Highlights of this release:

* Updated graphing modules to use cartopy instead of basemap (basemap can still be used in radarmapdisplaybasemap and gridmapdisplaybasemap modules).
* Fix for nexrad NL2
* Added cartopy examples.
* New Velocity Azimuth Display and Quasi Vertical Profile modules
* Default colormap is now the HomeyerRainbow color vision deficiency friendly.
* Unit tests are now geared towards pytest
* Steiner classification in full Python
* Add VRADH and VRADV quantities to ODIM H5 decoder
* New Py-ART cheatsheet.
* New differential attenuation code
* And much much more.

Contributors to Py-ART 1.10.1 Impressionism:

Gama Anderson
Jason Hemedinger
Jordi Figueras
Jussi Tiira
Kai Muehlbauer
Nathan Goldbaum
Nick Guy
Robin Tanamachi
Rish Shadra
Robert Jackson
Scott Collis
striges
Tarmo Tanilsoo
Timothy Lang
Valentin Louf
Zachary Sherman
zxdawn