docs: add @LeovR as a contributor

Author: timonback

.all-contributorsrc

@@ -306,6 +306,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "LeovR",
+      "name": "Jan Marten",
+      "avatar_url": "https://avatars.githubusercontent.com/u/546795?v=4",
+      "profile": "https://www.janmarten.dev/",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -209,6 +209,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
       <td align="center" valign="top" width="14.28%"><a href="https://www.linkedin.com/in/victor-levitskiy-561956114/"><img src="https://avatars.githubusercontent.com/u/18309707?v=4?s=100" width="100px;" alt="Victor Levitskiy"/><br /><sub><b>Victor Levitskiy</b></sub></a><br /><a href="https://github.com/stavshamir/Springwolf/commits?author=victorlev01" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/ccudennec-otto"><img src="https://avatars.githubusercontent.com/u/158453078?v=4?s=100" width="100px;" alt="Christopher Cudennec"/><br /><sub><b>Christopher Cudennec</b></sub></a><br /><a href="https://github.com/stavshamir/Springwolf/commits?author=ccudennec-otto" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/dabeck81"><img src="https://avatars.githubusercontent.com/u/79102969?v=4?s=100" width="100px;" alt="dabeck81"/><br /><sub><b>dabeck81</b></sub></a><br /><a href="https://github.com/stavshamir/Springwolf/commits?author=dabeck81" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://www.janmarten.dev/"><img src="https://avatars.githubusercontent.com/u/546795?v=4?s=100" width="100px;" alt="Jan Marten"/><br /><sub><b>Jan Marten</b></sub></a><br /><a href="https://github.com/stavshamir/Springwolf/commits?author=LeovR" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>