docs: add rokoroku as a contributor (#141)

* docs: update README.md

* docs: update .all-contributorsrc

Author: allcontributors[bot]

.all-contributorsrc

@@ -200,6 +200,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "rokoroku",
+      "name": "Youngrok Kim",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/5208632?v=4",
+      "profile": "http://rokoroku.github.io",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -1041,6 +1041,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://kentcdodds.com"><img src="https://avatars0.githubusercontent.com/u/1500684?v=4" width="100px;" alt="Kent C. Dodds"/><br /><sub><b>Kent C. Dodds</b></sub></a><br /><a href="https://github.com/async-library/react-async/commits?author=kentcdodds" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/walter-ind"><img src="https://avatars2.githubusercontent.com/u/52423075?v=4" width="100px;" alt="walter-ind"/><br /><sub><b>walter-ind</b></sub></a><br /><a href="https://github.com/async-library/react-async/commits?author=walter-ind" title="Documentation">📖</a></td>
     <td align="center"><a href="https://twitter.com/arthurdenture"><img src="https://avatars3.githubusercontent.com/u/80536?v=4" width="100px;" alt="Jacob Lee"/><br /><sub><b>Jacob Lee</b></sub></a><br /><a href="https://github.com/async-library/react-async/commits?author=artdent" title="Code">💻</a></td>
+    <td align="center"><a href="http://rokoroku.github.io"><img src="https://avatars1.githubusercontent.com/u/5208632?v=4" width="100px;" alt="Youngrok Kim"/><br /><sub><b>Youngrok Kim</b></sub></a><br /><a href="https://github.com/async-library/react-async/commits?author=rokoroku" title="Code">💻</a></td>
   </tr>
 </table>