maintainer: add trundle

maintainers/maintainer-list.nix

···
     githubId = 1183303;
     name = "Jakob Klepp";
   };
+  trundle = {
+    name = "Andreas Stührk";
+    email = "[e-mail]";
+    github = "Trundle";
+    githubId = 332418;
+  };
   tscholak = {
     email = "[e-mail]";
     github = "tscholak";