I see this project is licensed under CC 1.0 terms.

I'm building a WordPress plugin where I think these icons would be very useful. But CC 1.0 license is not compatible with with WordPress GPL license (but CC 4.0 is)

Read more about it here - https://make.wordpress.org/plugins/2015/11/06/creative-commons-licenses-in-the-plugin-directory/

Would you be willing to change the license type if at all?
(Just to let you know, GPL requires a credit attribution to the original creator as well)

I look forward to hear from you!