docs: add KosukeSaigusa as a contributor for translation (#151)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -111,6 +111,15 @@
       "contributions": [
         "design"
       ]
+    },
+    {
+      "login": "KosukeSaigusa",
+      "name": "Kosuke Saigusa",
+      "avatar_url": "https://avatars.githubusercontent.com/u/13669049?v=4",
+      "profile": "https://github.com/KosukeSaigusa",
+      "contributions": [
+        "translation"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -412,6 +412,7 @@ Many thanks to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/Letalus"><img src="https://avatars.githubusercontent.com/u/41230136?v=4?s=50" width="50px;" alt=""/><br /><sub><b>Letalus</b></sub></a><br /><a href="https://github.com/fluttercandies/flutter_wechat_assets_picker/issues?q=author%3ALetalus" title="Bug reports">🐛</a> <a href="#translation-Letalus" title="Translation">🌍</a></td>
     <td align="center"><a href="https://github.com/greymag"><img src="https://avatars.githubusercontent.com/u/1502131?v=4?s=50" width="50px;" alt=""/><br /><sub><b>greymag</b></sub></a><br /><a href="#translation-greymag" title="Translation">🌍</a></td>
     <td align="center"><a href="https://github.com/NaikSoftware"><img src="https://avatars.githubusercontent.com/u/4218994?v=4?s=50" width="50px;" alt=""/><br /><sub><b>Nickolay Savchenko</b></sub></a><br /><a href="#design-NaikSoftware" title="Design">🎨</a></td>
+    <td align="center"><a href="https://github.com/KosukeSaigusa"><img src="https://avatars.githubusercontent.com/u/13669049?v=4?s=50" width="50px;" alt=""/><br /><sub><b>Kosuke Saigusa</b></sub></a><br /><a href="#translation-KosukeSaigusa" title="Translation">🌍</a></td>
   </tr>
 </table>