readme updates

Author: jdebacker

Productivity/README.md

@@ -138,4 +138,5 @@ In the text editors Atom and Sublime Text 3 you can install Linter packages that
 * [Unix commands](https://en.wikipedia.org/wiki/List_of_Unix_commands)
 * [DOS commands](https://en.wikipedia.org/wiki/List_of_DOS_commands)
 * [Git Basics](https://www.youtube.com/watch?v=U8GBXvdmHT4)
+* [Git Workflows](http://blog.endpoint.com/2014/05/git-workflows-that-work.html)
 * [Research Cyberinfrastructure at USC](http://www.sc.edu/about/offices_and_divisions/division_of_information_technology/rci/)

Visualization/README.md

@@ -17,6 +17,7 @@ This module of the course covers data visualization tools.  We'll learn these to
 * [Matplotlib guide](http://pbpython.com/effective-matplotlib.html)
 * [Overview of Python visualization tools](http://pbpython.com/visualization-tools-1.html)
 * [A Dramatic Tour Through Python's Data Visualization Landscape](https://dsaber.com/2016/10/02/a-dramatic-tour-through-pythons-data-visualization-landscape-including-ggplot-and-altair/)
+* [A Detailed Matplotlib Example](https://www.dataquest.io/blog/making-538-plots/)
 * [Matplotlib Gallery](https://matplotlib.org/gallery.html)
 * [Seaborn Gallery](https://seaborn.pydata.org/examples/index.html)
 * [Bokeh Gallery](https://bokeh.pydata.org/en/latest/docs/gallery.html)