update version number

src/Footer.js

@@ -4,7 +4,7 @@ function Footer() {
   return (
     <footer className="py-2 bg-dark fixed-bottom">
       <p className="m-0 text-center text-white">
-        Bernadette Hammerle | Project in Intelligent Information Systems | Juli 2021 | Version 4.0
+        Bernadette Hammerle | Project in Intelligent Information Systems | September 2021 | Version 5a
       </p>
     </footer>
   );