Python3 possible in current venv install.

[shiddy]

Issue Summary

Virtualenv docs should include a python environment version. Otherwise, the pathing in the ./mkdist script fails without a clear resolution. This will be common as more package managers default to installing python3 over python2

Without providing more explicit clarity within the venv setup, this will cause confusion.

Steps to Reproduce

1. ensure default python is set to Python 3+
2. $ virtualenv venv
3. $ source venv/bin/activate
4. $ pip install -r requirements.txt
5. $ ./mkdist

Technical details:

• krampus Version: master
• Python Version: 3.6