Update README.md

Add preprint tag to arxiv link
epfl-theos · Mar 29, 2023 · ced42b2 · ced42b2
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@@ -7,8 +7,8 @@ The package is available for download from [GitHub](http://github.com/aiida-defe
 
 If you use AiiDA-Defects in your work, please cite:
 
-*AiiDA-defects: An automated and fully reproducible workflow for the complete characterization of defect chemistry in functional materials*
-[doi.org/10.48550/arXiv.2303.12465](https://doi.org/10.48550/arXiv.2303.12465)
+*AiiDA-defects: An automated and fully reproducible workflow for the complete characterization of defect chemistry in functional materials* 
+[doi.org/10.48550/arXiv.2303.12465 (preprint)](https://doi.org/10.48550/arXiv.2303.12465)
 
 Please also remember to cite the [AiiDA paper](https://doi.org/10.1038/s41597-020-00638-4).