docs: update README.md [skip ci]

README.md

@@ -140,6 +140,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/aneisch"><img src="https://avatars1.githubusercontent.com/u/6991461?v=4" width="100px;" alt=""/><br /><sub><b>Andrew</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/commits?author=aneisch" title="Documentation">📖</a></td>
     <td align="center"><a href="https://github.com/sixcorners"><img src="https://avatars0.githubusercontent.com/u/585501?v=4" width="100px;" alt=""/><br /><sub><b>sixcorners</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/commits?author=sixcorners" title="Documentation">📖</a></td>
     <td align="center"><a href="https://piksel.se"><img src="https://avatars2.githubusercontent.com/u/807383?v=4" width="100px;" alt=""/><br /><sub><b>nils måsén</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/commits?author=piksel" title="Documentation">📖</a></td>
+    <td align="center"><a href="https://arnested.dk"><img src="https://avatars2.githubusercontent.com/u/190005?v=4" width="100px;" alt=""/><br /><sub><b>Arne Jørgensen</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/commits?author=arnested" title="Tests">⚠️</a> <a href="https://github.com/containrrr/watchtower/pulls?q=is%3Apr+reviewed-by%3Aarnested" title="Reviewed Pull Requests">👀</a></td>
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