docs: add rvdkooy as a contributor (#466)

* docs: update README.md

* docs: update .all-contributorsrc

Author: allcontributors[bot]

.all-contributorsrc

@@ -939,6 +939,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "rvdkooy",
+      "name": "Ronald van der Kooij",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/4119960?v=4",
+      "profile": "https://github.com/rvdkooy",
+      "contributions": [
+        "test"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -29,7 +29,7 @@ practices.</p>
 [![version][version-badge]][package] [![downloads][downloads-badge]][npmtrends]
 [![MIT License][license-badge]][license]
 
-[![All Contributors](https://img.shields.io/badge/all_contributors-97-orange.svg?style=flat-square)](#contributors)
+[![All Contributors](https://img.shields.io/badge/all_contributors-98-orange.svg?style=flat-square)](#contributors)
 [![PRs Welcome][prs-badge]][prs] [![Code of Conduct][coc-badge]][coc]
 [![Join the community on Spectrum][spectrum-badge]][spectrum]
 
@@ -509,6 +509,7 @@ Thanks goes to these people ([emoji key][emojis]):
     <td align="center"><a href="https://cimbul.com"><img src="https://avatars2.githubusercontent.com/u/927923?v=4" width="100px;" alt="Tim Yates"/><br /><sub><b>Tim Yates</b></sub></a><br /><a href="#review-cimbul" title="Reviewed Pull Requests">👀</a></td>
     <td align="center"><a href="https://github.com/eventualbuddha"><img src="https://avatars3.githubusercontent.com/u/1938?v=4" width="100px;" alt="Brian Donovan"/><br /><sub><b>Brian Donovan</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/commits?author=eventualbuddha" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/JaysQubeXon"><img src="https://avatars1.githubusercontent.com/u/18309230?v=4" width="100px;" alt="Noam Gabriel Jacobson"/><br /><sub><b>Noam Gabriel Jacobson</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/commits?author=JaysQubeXon" title="Documentation">📖</a></td>
+    <td align="center"><a href="https://github.com/rvdkooy"><img src="https://avatars1.githubusercontent.com/u/4119960?v=4" width="100px;" alt="Ronald van der Kooij"/><br /><sub><b>Ronald van der Kooij</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/commits?author=rvdkooy" title="Tests">⚠️</a></td>
   </tr>
 </table>