rasm: add sigmanificient to maintainers

pkgs/development/compilers/rasm/default.nix

···
     mainProgram = "rasm";
     # use -n option to display all licenses
     license = licenses.mit; # expat version
-    maintainers = [ ];
+    maintainers = with lib.maintainers; [ sigmanificient ];
     platforms = platforms.all;
   };
 }