gollum: Transfer maintainership to erictapen

I'm not using Gollum anymore while Justin still uses it and has also
written the NixOS module. So it makes perfect sense to pass it on :)

nixos/modules/services/misc/gollum.nix

@@ -115,4 +115,6 @@ in
       };
     };
   };
+
+  meta.maintainers = with lib.maintainers; [ erictapen ];
 }

pkgs/applications/misc/gollum/default.nix

@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
     homepage = "https://github.com/gollum/gollum";
     changelog = "https://github.com/gollum/gollum/blob/v${version}/HISTORY.md";
     license = licenses.mit;
-    maintainers = with maintainers; [ jgillich primeos nicknovitski ];
+    maintainers = with maintainers; [ erictapen jgillich nicknovitski ];
     platforms = platforms.unix;
   };
 }