Update README.md

Author: rafaelorozco

README.md

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 # InvertibleNetworks.jl
 
-| **Documentation** | **Build Status**  |                  |
+| **Documentation** | **Build Status**  |  **JOSS paper**  |
 |:-----------------:|:-----------------:|:----------------:|
-|[![](https://img.shields.io/badge/docs-stable-blue.svg)](https://slimgroup.github.io/InvertibleNetworks.jl/stable/) [![](https://img.shields.io/badge/docs-dev-blue.svg)](https://slimgroup.github.io/InvertibleNetworks.jl/dev/)| [![CI](https://github.com/slimgroup/InvertibleNetworks.jl/actions/workflows/runtests.yml/badge.svg)](https://github.com/slimgroup/InvertibleNetworks.jl/actions/workflows/runtests.yml)| [![DOI](https://zenodo.org/badge/239018318.svg)](https://zenodo.org/badge/latestdoi/239018318)
+|[![](https://img.shields.io/badge/docs-stable-blue.svg)](https://slimgroup.github.io/InvertibleNetworks.jl/stable/) [![](https://img.shields.io/badge/docs-dev-blue.svg)](https://slimgroup.github.io/InvertibleNetworks.jl/dev/)| [![CI](https://github.com/slimgroup/InvertibleNetworks.jl/actions/workflows/runtests.yml/badge.svg)](https://github.com/slimgroup/InvertibleNetworks.jl/actions/workflows/runtests.yml)|  [![DOI](https://joss.theoj.org/papers/10.21105/joss.06554/status.svg)](https://doi.org/10.21105/joss.06554)
+
 
 Building blocks for invertible neural networks in the [Julia] programming language.