made references.bib a reference in README.rst

Author: WolfgangWaltenberger

smodels/README.rst

@@ -69,7 +69,7 @@ Citation
 If you use this software please cite the SModelS v1-v3 manuals, the original
 SModelS publication, as well as the programs it makes use of.  For your
 convenience, the relevant citations are provided in bibtex format in
-*references.bib*.
+`references.bib <https://github.com/SModelS/smodels/blob/main/references.bib>`_.
 
 For citing the experimental analyses in the database, you can use
 `database.bib <https://github.com/SModelS/smodels-database-release/blob/main/database.bib>`_.