docs: add just-boris as a contributor (#568)

* docs: update README.md

* docs: update .all-contributorsrc

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

Author: allcontributors[bot]

.all-contributorsrc

@@ -745,6 +745,15 @@
         "code",
         "test"
       ]
+    },
+    {
+      "login": "just-boris",
+      "name": "Boris Serdiuk",
+      "avatar_url": "https://avatars.githubusercontent.com/u/812240?v=4",
+      "profile": "https://twitter.com/boriscoder",
+      "contributions": [
+        "bug"
+      ]
     }
   ],
   "commitConvention": "none",

README.md

@@ -685,6 +685,7 @@ Thanks goes to these people ([emoji key][emojis]):
     <td align="center"><a href="http://www.alex-boyce.me/"><img src="https://avatars.githubusercontent.com/u/4050934?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Alex Boyce</b></sub></a><br /><a href="https://github.com/testing-library/user-event/commits?author=curiosity26" title="Code">💻</a></td>
     <td align="center"><a href="https://benadamstyles.com"><img src="https://avatars.githubusercontent.com/u/4380655?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ben Styles</b></sub></a><br /><a href="https://github.com/testing-library/user-event/commits?author=benadamstyles" title="Code">💻</a> <a href="https://github.com/testing-library/user-event/commits?author=benadamstyles" title="Tests">⚠️</a></td>
     <td align="center"><a href="http://laurabeatris.com"><img src="https://avatars.githubusercontent.com/u/48022589?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Laura Beatris</b></sub></a><br /><a href="https://github.com/testing-library/user-event/commits?author=LauraBeatris" title="Code">💻</a> <a href="https://github.com/testing-library/user-event/commits?author=LauraBeatris" title="Tests">⚠️</a></td>
+    <td align="center"><a href="https://twitter.com/boriscoder"><img src="https://avatars.githubusercontent.com/u/812240?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Boris Serdiuk</b></sub></a><br /><a href="https://github.com/testing-library/user-event/issues?q=author%3Ajust-boris" title="Bug reports">🐛</a></td>
   </tr>
 </table>