docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -17,6 +17,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/jakubbogacz"><img src="https://avatars3.githubusercontent.com/u/26272028?v=4" width="100px;" alt="jakubbogacz"/><br /><sub><b>jakubbogacz</b></sub></a><br /><a href="#ideas-jakubbogacz" title="Ideas, Planning, & Feedback">🤔</a> <a href="https://github.com/sandstreamdev/std/pulls?q=is%3Apr+reviewed-by%3Ajakubbogacz" title="Reviewed Pull Requests">👀</a></td>
     <td align="center"><a href="https://github.com/marekrozmus"><img src="https://avatars3.githubusercontent.com/u/26272040?v=4" width="100px;" alt="Marek Rozmus"/><br /><sub><b>Marek Rozmus</b></sub></a><br /><a href="https://github.com/sandstreamdev/std/pulls?q=is%3Apr+reviewed-by%3Amarekrozmus" title="Reviewed Pull Requests">👀</a></td>
     <td align="center"><a href="http://www.pawelstanecki.pl"><img src="https://avatars1.githubusercontent.com/u/34007033?v=4" width="100px;" alt="Paweł"/><br /><sub><b>Paweł</b></sub></a><br /><a href="https://github.com/sandstreamdev/std/commits?author=kendyl93" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/kborucinski"><img src="https://avatars0.githubusercontent.com/u/3129656?v=4" width="100px;" alt="Krystian Boruciński"/><br /><sub><b>Krystian Boruciński</b></sub></a><br /><a href="https://github.com/sandstreamdev/std/commits?author=kborucinski" title="Code">💻</a></td>
   </tr>
 </table>