Add @adkenyon as a contributor

Author: Nader Dabit

.all-contributorsrc

@@ -211,6 +211,16 @@
         "test",
         "infra"
       ]
+    },
+    {
+      "login": "adkenyon",
+      "name": "Alan Kenyon",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/4999026?v=4",
+      "profile": "https://github.com/adkenyon",
+      "contributions": [
+        "doc",
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7

README.md

@@ -213,6 +213,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="http://twitter.com/pistoudev"><img src="https://avatars1.githubusercontent.com/u/6703711?v=4" width="100px;" alt=""/><br /><sub><b>Pierre Skowron</b></sub></a><br /><a href="https://github.com/react-native-community/hooks/commits?author=pistou" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/Gamal-Shaban"><img src="https://avatars1.githubusercontent.com/u/17288652?v=4" width="100px;" alt=""/><br /><sub><b>Gamal Shaban</b></sub></a><br /><a href="https://github.com/react-native-community/hooks/commits?author=Gamal-Shaban" title="Code">💻</a> <a href="https://github.com/react-native-community/hooks/commits?author=Gamal-Shaban" title="Documentation">📖</a> <a href="https://github.com/react-native-community/hooks/commits?author=Gamal-Shaban" title="Tests">⚠️</a></td>
     <td align="center"><a href="https://tgrm.github.io/GregBush"><img src="https://avatars3.githubusercontent.com/u/44202486?v=4" width="100px;" alt=""/><br /><sub><b>Greg-Bush</b></sub></a><br /><a href="https://github.com/react-native-community/hooks/commits?author=Greg-Bush" title="Documentation">📖</a> <a href="https://github.com/react-native-community/hooks/commits?author=Greg-Bush" title="Code">💻</a> <a href="https://github.com/react-native-community/hooks/commits?author=Greg-Bush" title="Tests">⚠️</a> <a href="#infra-Greg-Bush" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+    <td align="center"><a href="https://github.com/adkenyon"><img src="https://avatars0.githubusercontent.com/u/4999026?v=4" width="100px;" alt=""/><br /><sub><b>Alan Kenyon</b></sub></a><br /><a href="https://github.com/react-native-community/hooks/commits?author=adkenyon" title="Documentation">📖</a> <a href="https://github.com/react-native-community/hooks/commits?author=adkenyon" title="Code">💻</a></td>
   </tr>
 </table>