docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -3,7 +3,8 @@
 [![image](https://codecov.io/gh/astro-informatics/s2fft/branch/main/graph/badge.svg?token=7QYAFAAWLE)](https://codecov.io/gh/astro-informatics/s2fft)
 [![image](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![image](http://img.shields.io/badge/arXiv-xxxx.xxxxx-orange.svg?style=flat)](https://arxiv.org/abs/xxxx.xxxxx)<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-5-orange.svg?style=flat-square)](#contributors-) <!-- ALL-CONTRIBUTORS-BADGE:END --> 
+[![All Contributors](https://img.shields.io/badge/all_contributors-6-orange.svg?style=flat-square)](#contributors-)
+<!-- ALL-CONTRIBUTORS-BADGE:END --> 
 [![image](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
 <img align="left" height="85" width="98" src="./docs/assets/sax_logo.png">
@@ -146,6 +147,7 @@ key](https://allcontributors.org/docs/en/emoji-key)):
       <td align="center" valign="top" width="14.28%"><a href="http://matt-graham.github.io"><img src="https://avatars.githubusercontent.com/u/6746980?v=4?s=100" width="100px;" alt="Matt Graham"/><br /><sub><b>Matt Graham</b></sub></a><br /><a href="https://github.com/astro-informatics/s2fft/commits?author=matt-graham" title="Code">💻</a> <a href="https://github.com/astro-informatics/s2fft/pulls?q=is%3Apr+reviewed-by%3Amatt-graham" title="Reviewed Pull Requests">👀</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://sfmig.github.io/"><img src="https://avatars.githubusercontent.com/u/33267254?v=4?s=100" width="100px;" alt="sfmig"/><br /><sub><b>sfmig</b></sub></a><br /><a href="https://github.com/astro-informatics/s2fft/commits?author=sfmig" title="Code">💻</a> <a href="https://github.com/astro-informatics/s2fft/pulls?q=is%3Apr+reviewed-by%3Asfmig" title="Reviewed Pull Requests">👀</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/Devaraj-G"><img src="https://avatars.githubusercontent.com/u/36169767?v=4?s=100" width="100px;" alt="Devaraj Gopinathan"/><br /><sub><b>Devaraj Gopinathan</b></sub></a><br /><a href="https://github.com/astro-informatics/s2fft/commits?author=Devaraj-G" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="http://flanusse.net"><img src="https://avatars.githubusercontent.com/u/861591?v=4?s=100" width="100px;" alt="Francois Lanusse"/><br /><sub><b>Francois Lanusse</b></sub></a><br /><a href="https://github.com/astro-informatics/s2fft/commits?author=EiffL" title="Code">💻</a> <a href="https://github.com/astro-informatics/s2fft/issues?q=author%3AEiffL" title="Bug reports">🐛</a></td>
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   </tbody>
 </table>