discrete-scroll: added myself as maintainer

maintainers/maintainer-list.nix

···
     github = "wilsonehusin";
     githubId = 14004487;
   };
+  bb2020 = {
+    email = "[e-mail]";
+    github = "bb2020";
+    githubId = 19290397;
+    name = "Tunc Uzlu";
+  };
 }

pkgs/os-specific/darwin/discrete-scroll/default.nix

···
     homepage = "https://github.com/emreyolcu/discrete-scroll";
     platforms = platforms.darwin;
     license = licenses.mit;
+    maintainers = with lib.maintainers; [ bb2020 ];
   };
 }