These icons were downloaded from the Font Awesome project (https://fontawesome.com)

They are licensed under the "Creative Commons Attribution 4.0 International license",
according to https://fontawesome.com/license/free on 21 May 2019.

The link to the license is here: https://creativecommons.org/licenses/by-sa/4.0/

Some icons have been modified slightly (color changes, minor additions).
