add maintainer: heyimnova

maintainers/maintainer-list.nix

···
     githubId = 41522204;
     name = "hexchen";
   };
+  heyimnova = {
+    email = "[e-mail]";
+    github = "heyimnova";
+    githubId = 115728866;
+    name = "Nova Witterick";
+    keys = [{
+      fingerprint = "4304 6B43 8D83 078E 3DF7  10D6 DEB0 E15C 6D2A 5A7C";
+    }];
+  };
   hh = {
     email = "[e-mail]";
     github = "HarryMakes";