minecraft-server: add jyooru as maintainer

pkgs/games/minecraft-server/derivation.nix

···
     homepage = "https://minecraft.net";
     license = licenses.unfreeRedistributable;
     platforms = platforms.unix;
-    maintainers = with maintainers; [ thoughtpolice tomberek costrouc ];
+    maintainers = with maintainers; [ thoughtpolice tomberek costrouc jyooru ];
   };
 }