Updated README.md

[Unknown303YT]

This pull request will fix some errors in the tutorial, and gives people a little more control over their lights.

Changelog:

• [Line 41] Replaced 2020 with 2022
• [Line 70] Replaced pip with pip3 for Python 3
• [Line 95] Replaced python with python3 for Python 3
• [Line 109] Added info about changing the default color

@larochefoucald

[Unknown303YT]

Thank you @larochefoucald ! I love contributing and helping with what I can, even though I am semi-new to coding and new to GitHub