docs: add afontcu as a contributor (#458)

* docs: update README.md

* docs: update .all-contributorsrc

Author: allcontributors[bot]

.all-contributorsrc

@@ -891,7 +891,8 @@
       "avatar_url": "https://avatars0.githubusercontent.com/u/9197791?v=4",
       "profile": "https://afontcu.dev",
       "contributions": [
-        "review"
+        "review",
+        "doc"
       ]
     },
     {

README.md

@@ -505,7 +505,7 @@ Thanks goes to these people ([emoji key][emojis]):
     <td align="center"><a href="https://twitter.com/sebsilbermann"><img src="https://avatars3.githubusercontent.com/u/12292047?v=4" width="100px;" alt="Sebastian Silbermann"/><br /><sub><b>Sebastian Silbermann</b></sub></a><br /><a href="#review-eps1lon" title="Reviewed Pull Requests">👀</a></td>
   </tr>
   <tr>
-    <td align="center"><a href="https://afontcu.dev"><img src="https://avatars0.githubusercontent.com/u/9197791?v=4" width="100px;" alt="Adrià Fontcuberta"/><br /><sub><b>Adrià Fontcuberta</b></sub></a><br /><a href="#review-afontcu" title="Reviewed Pull Requests">👀</a></td>
+    <td align="center"><a href="https://afontcu.dev"><img src="https://avatars0.githubusercontent.com/u/9197791?v=4" width="100px;" alt="Adrià Fontcuberta"/><br /><sub><b>Adrià Fontcuberta</b></sub></a><br /><a href="#review-afontcu" title="Reviewed Pull Requests">👀</a> <a href="https://github.com/testing-library/react-testing-library/commits?author=afontcu" title="Documentation">📖</a></td>
     <td align="center"><a href="https://blog.johnnyreilly.com/"><img src="https://avatars0.githubusercontent.com/u/1010525?v=4" width="100px;" alt="John Reilly"/><br /><sub><b>John Reilly</b></sub></a><br /><a href="#review-johnnyreilly" title="Reviewed Pull Requests">👀</a></td>
     <td align="center"><a href="https://michaeldeboey.be"><img src="https://avatars3.githubusercontent.com/u/6643991?v=4" width="100px;" alt="Michaël De Boey"/><br /><sub><b>Michaël De Boey</b></sub></a><br /><a href="#review-MichaelDeBoey" title="Reviewed Pull Requests">👀</a></td>
     <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>