Add Juan Nunez-Iglesias as co-author (#396)

AUTHORS.md

@@ -15,6 +15,7 @@ order by last name) and are considered "The Pooch Developers":
 * [John Leeman](https://github.com/jrleeman)
 * [Björn Ludwig](https://github.com/BjoernLudwigPTB) - Physikalisch-Technische Bundesanstalt, Germany (ORCID: [0000-0002-5910-9137](https://www.orcid.org/0000-0002-5910-9137))
 * [Daniel McCloy](https://github.com/drammock) - University of Washington, USA (ORCID: [0000-0002-7572-3241](https://orcid.org/0000-0002-7572-3241))
+* [Juan Nunez-Iglesias](https://github.com/jni) - Monash University, Australia (ORCID: [0000-0002-7239-5828](https://orcid.org/0000-0002-7239-5828))
 * [Rémi Rampin](https://github.com/remram44) - New York University, USA (ORCID: [0000-0002-0524-2282](https://www.orcid.org/0000-0002-0524-2282))
 * [Clément Robert](https://github.com/neutrinoceros) - Institut de Planétologie et d'Astrophysique de Grenoble, France (ORCID: [0000-0001-8629-7068](https://orcid.org/0000-0001-8629-7068))
 * [Daniel Shapero](https://github.com/danshapero) - Polar Science Center, University of Washington Applied Physics Lab, USA (ORCID: [0000-0002-3651-0649](https://www.orcid.org/0000-0002-3651-0649))