docs: update README.md [skip ci]

README.md

@@ -179,7 +179,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
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       <td align="center" valign="top" width="14.28%"><a href="https://andrewbrereton.com"><img src="https://avatars.githubusercontent.com/u/682893?v=4?s=100" width="100px;" alt="Andrew Brereton"/><br /><sub><b>Andrew Brereton</b></sub></a><br /><a href="#content-andrewbrereton" title="Content">🖋</a></td>
-      <td align="center" valign="top" width="14.28%"><a href="https://fsackur.github.io/"><img src="https://avatars.githubusercontent.com/u/3678789?v=4?s=100" width="100px;" alt="Freddie Sackur"/><br /><sub><b>Freddie Sackur</b></sub></a><br /><a href="https://github.com/meienberger/runtipi/commits?author=fsackur" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://fsackur.github.io/"><img src="https://avatars.githubusercontent.com/u/3678789?v=4?s=100" width="100px;" alt="Freddie Sackur"/><br /><sub><b>Freddie Sackur</b></sub></a><br /><a href="https://github.com/meienberger/runtipi/commits?author=fsackur" title="Code">💻</a> <a href="https://github.com/meienberger/runtipi/commits?author=fsackur" title="Documentation">📖</a></td>
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