updated attributions, unified filenames

README.md

@@ -19,4 +19,5 @@ All patterns [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0
 * "Tastaturstern" based on the 18c3 logo, original design by unknown
 * "Chaosknoten" based on Chaos Computer Club e.V. logo, originally based on a draft by [Wau Holland](https://www.wauland.de/)
 * "GPN23 characters" partially based on original font design (A, D, E, H, I, N, P, S, T) by GPN23 design team 
-* "Volle Transparenz" based on MRMCD25 logo, inspired by a variation by [tonda](https://chaos.social/@tonda)
+* "Volle Transparenz" based on MRMCD25 logo, inspired by a variation by [tonda](https://chaos.social/@tonda)
+* "Jugend hackt-Alpaca" based on original design by Rainbow Unicorn (https://rainbow-unicorn.com/), 2013