added info to readme

Author: werpuc

README.md

@@ -1,3 +1,7 @@
+<span style=color:red>
+  This is the repository for the first HaDeX version. We recommend using the newest one, [HaDeX2](https://github.com/hadexversum/HaDeX2).
+</span>
+
 [![published in: Bioinformatics](https://img.shields.io/badge/published%20in-Bioinformatics-green.svg)](http://dx.doi.org/10.1093/bioinformatics/btaa587)
 [![R build status](https://github.com/hadexversum/HaDeX/workflows/R-CMD-check/badge.svg)](https://github.com/hadexversum/HaDeX/actions)
 [![CRAN_Status_Badge](https://www.r-pkg.org/badges/version/HaDeX)](https://cran.r-project.org/package=HaDeX)