docs: update AUTHORS.md [skip ci]

AUTHORS.md

@@ -357,6 +357,7 @@ authors.
   <td align="center" valign="top" width="12.5%"><a href="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/danieltinazzi"><img src="https://avatars.githubusercontent.com/u/11833533?v=4?s=100" width="100px;" alt="Daniel Tinazzi"/><br /><sub><b>Daniel Tinazzi</b></sub></a><br /><a href="#content-danieltinazzi" title="Content">🖋</a></td>
   <td align="center" valign="top" width="12.5%"><a href="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/raymon-roos"><img src="https://avatars.githubusercontent.com/u/38888470?v=4?s=100" width="100px;" alt="Raymon Roos"/><br /><sub><b>Raymon Roos</b></sub></a><br /><a href="#content-raymon-roos" title="Content">🖋</a></td>
   <td align="center" valign="top" width="12.5%"><a href="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/matthri"><img src="https://avatars.githubusercontent.com/u/67913999?v=4?s=100" width="100px;" alt="Matthias"/><br /><sub><b>Matthias</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=matthri" title="Code">💻</a></td>
+  <td align="center" valign="top" width="12.5%"><a href="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/neuschaefer"><img src="https://avatars.githubusercontent.com/u/1021512?v=4?s=100" width="100px;" alt="J. Neuschäfer"/><br /><sub><b>J. Neuschäfer</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=neuschaefer" title="Code">💻</a></td>
  </tr>
  </tbody>
 </table>