Fix link to RUPS: it should point to RUPS 7 instead of RUPS 5

Author: Snipx

README.md

@@ -52,6 +52,6 @@ Contact [sales] for more info.
 [latest]: https://github.com/itext/itext7/releases/latest
 [sales]: https://itextpdf.com/sales
 [gratis]: https://en.wikipedia.org/wiki/Gratis_versus_libre
-[rups]: https://github.com/itext/rups
+[rups]: https://github.com/itext/i7j-rups
 [pdfhtml]: https://github.com/itext/i7j-pdfhtml
 [pdfsweep]: https://github.com/itext/i7j-pdfsweep