Update installation process in Readme

Currently the installation process is not up to date:

• It's referring to Python 3.6 instead of 3.8+
• USE_TZ = False is not required anymore, is it?
• Anything else?

changed milestone to %1.0-alpha2 — Precise Pheasant

added To Do label

changed milestone to %Aura 0.9

closed

removed To Do label