Add nsnelson to maintainers and selectdefaultapplication

maintainers/maintainer-list.nix

···
     githubId = 20391;
     name = "Nahum Shalman";
   };
+  nsnelson = {
+    email = "[e-mail]";
+    github = "peeley";
+    githubId = 30942198;
+    name = "Noah Snelson";
+  };
   nthorne = {
     email = "[e-mail]";
     github = "nthorne";

pkgs/applications/misc/selectdefaultapplication/default.nix

···
   meta = with lib; {
     description = "A very simple application that lets you define default applications on Linux in a sane way";
     homepage = "https://github.com/sandsmark/selectdefaultapplication";
+    maintainers = with maintainers; [ nsnelson ];
     license = licenses.gpl2;
     platforms = platforms.linux;
   };