gammastep: add eclairevoyant to maintainers

pkgs/applications/misc/redshift/default.nix

···
         + lib.removePrefix "Redshift" redshift.meta.longDescription;
       homepage = "https://gitlab.com/chinstrap/gammastep";
       mainProgram = "gammastep";
-      maintainers = [ lib.maintainers.primeos ] ++ redshift.meta.maintainers;
+      maintainers = (with lib.maintainers; [ eclairevoyant primeos ]) ++ redshift.meta.maintainers;
     };
   };
 }