Update README with valid links for acknowledgment

README.md

@@ -207,4 +207,4 @@ You can cite the article on our blog: https://kb-labb.github.io/posts/2021-08-23
 
 ## Acknowledgements
 
-We gratefully acknowledge the HPC RIVR consortium ([www.hpc-rivr.si](www.hpc-rivr.si)) and EuroHPC JU ([eurohpc-ju.europa.eu/](https://eurohpc-ju.europa.eu/)) for funding this research by providing computing resources of the HPC system Vega at the Institute of Information Science ([www.izum.si](www.izum.si)).
+We gratefully acknowledge the HPC RIVR consortium ([www.hpc-rivr.si](https://www.hpc-rivr.si/)) and EuroHPC JU ([eurohpc-ju.europa.eu/](https://eurohpc-ju.europa.eu/)) for funding this research by providing computing resources of the HPC system Vega at the Institute of Information Science ([www.izum.si](https://www.izum.si/)).