docs: add sibelius as a contributor (#125)

* docs: update README.md

* docs: update .all-contributorsrc

Author: allcontributors[bot]

.all-contributorsrc

@@ -87,6 +87,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "sibelius",
+      "name": "Sibelius Seraphini",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/2005841?v=4",
+      "profile": "https://twitter.com/sseraphini",
+      "contributions": [
+        "review"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -1027,6 +1027,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
   </tr>
   <tr>
     <td align="center"><a href="http://philippeterson.com/"><img src="https://avatars1.githubusercontent.com/u/1326208?v=4" width="100px;" alt="Philip Peterson"/><br /><sub><b>Philip Peterson</b></sub></a><br /><a href="https://github.com/async-library/react-async/commits?author=philip-peterson" title="Code">💻</a></td>
+    <td align="center"><a href="https://twitter.com/sseraphini"><img src="https://avatars3.githubusercontent.com/u/2005841?v=4" width="100px;" alt="Sibelius Seraphini"/><br /><sub><b>Sibelius Seraphini</b></sub></a><br /><a href="#review-sibelius" title="Reviewed Pull Requests">👀</a></td>
   </tr>
 </table>