docs: add jonaskuske as a contributor for code (#572)

Author: allcontributors[bot]

.all-contributorsrc

@@ -484,6 +484,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "jonaskuske",
+      "name": "Jonas Kuske",
+      "avatar_url": "https://avatars.githubusercontent.com/u/30421456?v=4",
+      "profile": "https://jonaskuske.com",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -284,6 +284,7 @@ Thanks goes to these people ([emoji key][emojis]):
     </tr>
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/MattijsE"><img src="https://avatars.githubusercontent.com/u/9746064?v=4?s=100" width="100px;" alt="MattijsE"/><br /><sub><b>MattijsE</b></sub></a><br /><a href="https://github.com/testing-library/angular-testing-library/commits?author=MattijsE" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://jonaskuske.com"><img src="https://avatars.githubusercontent.com/u/30421456?v=4?s=100" width="100px;" alt="Jonas Kuske"/><br /><sub><b>Jonas Kuske</b></sub></a><br /><a href="https://github.com/testing-library/angular-testing-library/commits?author=jonaskuske" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>