docs: add exeldro as a contributor for code (#31)

* docs: update README.md
* docs: update .all-contributorsrc

---------

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

.all-contributorsrc

@@ -16,6 +16,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "exeldro",
+      "name": "Exeldro",
+      "avatar_url": "https://avatars.githubusercontent.com/u/5457024?v=4",
+      "profile": "https://github.com/exeldro",
+      "contributions": [
+        "code"
+      ]
     }
   ]
 }

README.md

@@ -119,6 +119,7 @@ All of the same options as [Source](#source), but allows you to select an image
   <tbody>
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/FiniteSingularity"><img src="https://avatars.githubusercontent.com/u/72580859?v=4?s=100" width="100px;" alt="FiniteSingularity"/><br /><sub><b>FiniteSingularity</b></sub></a><br /><a href="#doc-FiniteSingularity" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/exeldro"><img src="https://avatars.githubusercontent.com/u/5457024?v=4?s=100" width="100px;" alt="Exeldro"/><br /><sub><b>Exeldro</b></sub></a><br /><a href="#code-exeldro" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>