docs: add jcelerier as a contributor (#5059)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -2395,6 +2395,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "jcelerier",
+      "name": "Jean-Michaël Celerier",
+      "avatar_url": "https://avatars.githubusercontent.com/u/2772730?v=4",
+      "profile": "https://jcelerier.name",
+      "contributions": [
+        "bug"
+      ]
     }
   ],
   "repoType": "github",

README.md

@@ -469,6 +469,7 @@ We recognize all types of contributions. This project follows the [all-contribut
   <tr>
     <td align="center"><a href="https://github.com/satyasaibhushan"><img src="https://avatars.githubusercontent.com/u/40578313?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Sai Bhushan</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=satyasaibhushan" title="Code">💻</a> <a href="https://github.com/processing/p5.js/commits?author=satyasaibhushan" title="Documentation">📖</a></td>
     <td align="center"><a href="https://github.com/vulongphan"><img src="https://avatars.githubusercontent.com/u/46087559?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Long Phan</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=vulongphan" title="Code">💻</a></td>
+    <td align="center"><a href="https://jcelerier.name"><img src="https://avatars.githubusercontent.com/u/2772730?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Jean-Michaël Celerier</b></sub></a><br /><a href="https://github.com/processing/p5.js/issues?q=author%3Ajcelerier" title="Bug reports">🐛</a></td>
   </tr>
 </table>