docs: update AUTHORS.md [skip ci]

Author: allcontributors[bot]

AUTHORS.md

@@ -382,6 +382,7 @@ authors.
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       <td align="center" valign="top" width="12.5%"><a href="http://wznmickey.com"><img src="https://avatars.githubusercontent.com/u/44784663?v=4?s=100" width="100px;" alt="wznmickey"/><br /><sub><b>wznmickey</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=wznmickey" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/NicolasRoelandt"><img src="https://avatars.githubusercontent.com/u/8594193?v=4?s=100" width="100px;" alt="NicolasRoelandt"/><br /><sub><b>NicolasRoelandt</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=NicolasRoelandt" title="Documentation">📖</a></td>
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 </table>