docs: add AriPerkkio as a contributor (#879)

* 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

@@ -1242,6 +1242,15 @@
         "bug",
         "code"
       ]
+    },
+    {
+      "login": "AriPerkkio",
+      "name": "Ari Perkkiö",
+      "avatar_url": "https://avatars.githubusercontent.com/u/14806298?v=4",
+      "profile": "https://codepen.io/ariperkkio/",
+      "contributions": [
+        "test"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -606,6 +606,7 @@ Thanks goes to these people ([emoji key][emojis]):
     <td align="center"><a href="https://github.com/marcosvega91"><img src="https://avatars2.githubusercontent.com/u/5365582?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Marco Moretti</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/commits?author=marcosvega91" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/sanchit121"><img src="https://avatars2.githubusercontent.com/u/30828115?v=4?s=100" width="100px;" alt=""/><br /><sub><b>sanchit121</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/issues?q=author%3Asanchit121" title="Bug reports">🐛</a> <a href="https://github.com/testing-library/react-testing-library/commits?author=sanchit121" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/solufa"><img src="https://avatars.githubusercontent.com/u/9402912?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Solufa</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/issues?q=author%3Asolufa" title="Bug reports">🐛</a> <a href="https://github.com/testing-library/react-testing-library/commits?author=solufa" title="Code">💻</a></td>
+    <td align="center"><a href="https://codepen.io/ariperkkio/"><img src="https://avatars.githubusercontent.com/u/14806298?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ari Perkkiö</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/commits?author=AriPerkkio" title="Tests">⚠️</a></td>
   </tr>
 </table>