Update License information

21st January 2022: This work is released under the 'Attribution 4.0 International (CC BY 4.0)' license. This means you are allowed to:

• Share my work in any medium or format;
• Adapt my work for any purpose, including commercially.

In order to use my work you need to give appropriate credit (or attribution). You can do so by including the following text in your credit list:

'Some pixels by Pixel Lad - www.pixellad.com'

For more information about the details about this license form, check the Creative Commons website: https://creativecommons.org/licenses/by/4.0/