Changed reference to be cited from ISMIR demo to JOSS paper

README.md

@@ -61,13 +61,18 @@ make test
 If you use **Spleeter** in your work, please cite:
 
 ```BibTeX
-@misc{spleeter2019,
-  title={Spleeter: A Fast And State-of-the Art Music Source Separation Tool With Pre-trained Models},
-  author={Romain Hennequin and Anis Khlif and Felix Voituret and Manuel Moussallam},
-  howpublished={Late-Breaking/Demo ISMIR 2019},
-  month={November},
-  note={Deezer Research},
-  year={2019}
+@article{spleeter2020,
+  doi = {10.21105/joss.02154},
+  url = {https://doi.org/10.21105/joss.02154},
+  year = {2020},
+  publisher = {The Open Journal},
+  volume = {5},
+  number = {50},
+  pages = {2154},
+  author = {Romain Hennequin and Anis Khlif and Felix Voituret and Manuel Moussallam},
+  title = {Spleeter: a fast and efficient music source separation tool with pre-trained models},
+  journal = {Journal of Open Source Software},
+  note = {Deezer Research}
 }
 ```