docs: add Dev-CasperTheGhost as a contributor for code (#104)

* docs: update README.md

* docs: update .all-contributorsrc

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -120,6 +120,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "Dev-CasperTheGhost",
+      "name": "Casper",
+      "avatar_url": "https://avatars.githubusercontent.com/u/53900565?v=4",
+      "profile": "https://caspertheghost.me",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "commitConvention": "none"

README.md

@@ -723,6 +723,7 @@ Thanks goes to these people ([emoji key][emojis]):
     <td align="center"><a href="https://github.com/gaelhameon"><img src="https://avatars.githubusercontent.com/u/17253950?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Gaël Haméon</b></sub></a><br /><a href="https://github.com/kentcdodds/mdx-bundler/commits?author=gaelhameon" title="Documentation">📖</a></td>
     <td align="center"><a href="https://github.com/loiacon"><img src="https://avatars.githubusercontent.com/u/32134586?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Gabriel Loiácono</b></sub></a><br /><a href="https://github.com/kentcdodds/mdx-bundler/commits?author=loiacon" title="Code">💻</a> <a href="https://github.com/kentcdodds/mdx-bundler/commits?author=loiacon" title="Tests">⚠️</a></td>
     <td align="center"><a href="https://skovy.dev"><img src="https://avatars.githubusercontent.com/u/5247455?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Spencer Miskoviak</b></sub></a><br /><a href="https://github.com/kentcdodds/mdx-bundler/commits?author=skovy" title="Documentation">📖</a></td>
+    <td align="center"><a href="https://caspertheghost.me"><img src="https://avatars.githubusercontent.com/u/53900565?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Casper</b></sub></a><br /><a href="https://github.com/kentcdodds/mdx-bundler/commits?author=Dev-CasperTheGhost" title="Code">💻</a></td>
   </tr>
 </table>