Python 3

[limburgher]

Python 2 is going away next year. Python 3 plans?

https://bugzilla.redhat.com/show_bug.cgi?id=1737859

[freddii]

install with python3:

git clone -b python3 https://github.com/indritbashkimi/slingshot
cd slingshot
python3 setup.py build
sudo python3 setup.py install