Add MattiSG as a contributor for data and code

#7

Author: allcontributors[bot]

.all-contributors.md

@@ -6,6 +6,7 @@ This file is required by [All Contributors](https://allcontributors.org/) to wor
 <table>
   <tbody>
     <tr>
+      <td align="center" valign="top" width="14.28%"><a href="https://mattischneider.fr"><img src="https://avatars.githubusercontent.com/u/222463?v=4?s=100" width="100px;" alt="Matti Schneider"/><br /><sub><b>Matti Schneider</b></sub></a><br /><a href="#data-MattiSG" title="Data">🔣</a> <a href="https://github.com/OpenTermsArchive/dsa-reports-declarations/commits?author=MattiSG" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://clementbiron.com"><img src="https://avatars.githubusercontent.com/u/364319?v=4?s=100" width="100px;" alt="Clément Biron"/><br /><sub><b>Clément Biron</b></sub></a><br /><a href="#infra-clementbiron" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
     </tr>
   </tbody>

.all-contributorsrc

@@ -13,6 +13,16 @@
       "contributions": [
         "infra"
       ]
+    },
+    {
+      "login": "MattiSG",
+      "name": "Matti Schneider",
+      "avatar_url": "https://avatars.githubusercontent.com/u/222463?v=4",
+      "profile": "https://mattischneider.fr",
+      "contributions": [
+        "data",
+        "code"
+      ]
     }
   ],
   "repoType": "github",