Adding nickname

Hacker News bemoaned that real name aren't be easily connected with the nicknames online.
Let's fix that!

Signed-off-by: André Jaenisch <ryuno-ki@noreply.codeberg.org>

README.md

@@ -48,7 +48,7 @@ Signatures:
 
 * Loïc Dachary
 * Aravinth Manivannan
-* André Jaenisch
+* André Jaenisch (Ryuno-Ki)
 * Arnold Schrijver
 * Anthony Wang
 * Johannes Schnürle