docs: add nstepien as a contributor for code (#222)

* 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

@@ -313,6 +313,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "nstepien",
+      "name": "Nicolas Stepien",
+      "avatar_url": "https://avatars.githubusercontent.com/u/567105?v=4",
+      "profile": "https://github.com/nstepien",
+      "contributions": [
+        "code"
+      ]
     }
   ]
 }

README.md

@@ -209,6 +209,7 @@ Thanks goes to these people ([emoji key][emojis]):
     <td align="center"><a href="https://www.zhihu.com/people/lucas-hc/activities"><img src="https://avatars.githubusercontent.com/u/19988985?v=4?s=100" width="100px;" alt=""/><br /><sub><b>HOU Ce</b></sub></a><br /><a href="https://github.com/kentcdodds/kcd-scripts/commits?author=HOUCe" title="Code">💻</a></td>
     <td align="center"><a href="https://codepen.io/ariperkkio/"><img src="https://avatars.githubusercontent.com/u/14806298?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ari Perkkiö</b></sub></a><br /><a href="https://github.com/kentcdodds/kcd-scripts/commits?author=AriPerkkio" title="Code">💻</a> <a href="https://github.com/kentcdodds/kcd-scripts/commits?author=AriPerkkio" title="Tests">⚠️</a></td>
     <td align="center"><a href="https://solverfox.dev"><img src="https://avatars.githubusercontent.com/u/12292047?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Sebastian Silbermann</b></sub></a><br /><a href="https://github.com/kentcdodds/kcd-scripts/commits?author=eps1lon" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/nstepien"><img src="https://avatars.githubusercontent.com/u/567105?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Nicolas Stepien</b></sub></a><br /><a href="https://github.com/kentcdodds/kcd-scripts/commits?author=nstepien" title="Code">💻</a></td>
   </tr>
 </table>