Is your feature request related to a problem? Please describe.
As January 1st approaches, support for "Python 2" gets to its end. By deprecating it we can free some machine/time on CI and maybe simplify our "dependency matrix"

Note that this issue is not meant to be executed before the January 1st 2020. The early public issue is just to track it and talk/communicate about.

Describe the solution you'd like

• Remove py2 from the build matrix in Jenkins
• Remove Python 2 from setup.py
• Remove six from requirements.txt
• Remove the announcement banner in README.md