docs: add yujune as a contributor for code (#274)

Adds @yujune as a contributor for code.

This was requested by AlexV525 [in this
comment](#268 (comment))

[skip ci]

---------

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

.all-contributorsrc

@@ -115,6 +115,15 @@
       "contributions": [
         "bug"
       ]
+    },
+    {
+      "login": "yujune",
+      "name": "Tee Yu June",
+      "avatar_url": "https://avatars.githubusercontent.com/u/56582497?v=4",
+      "profile": "https://github.com/yujune",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -254,6 +254,7 @@ Thank goes to these wonderful people ([emoji key](https://allcontributors.org/do
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/ZhuBoao"><img src="https://avatars.githubusercontent.com/u/17305573?v=4?s=50" width="50px;" alt="LeonardoZhu"/><br /><sub><b>LeonardoZhu</b></sub></a><br /><a href="https://github.com/fluttercandies/flutter_wechat_camera_picker/commits?author=ZhuBoao" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://www.linkedin.com/in/loinp"><img src="https://avatars.githubusercontent.com/u/34020090?v=4?s=50" width="50px;" alt="Nguyen Phuc Loi"/><br /><sub><b>Nguyen Phuc Loi</b></sub></a><br /><a href="#translation-nploi" title="Translation">🌍</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://amoshk.top"><img src="https://avatars.githubusercontent.com/u/32262985?v=4?s=50" width="50px;" alt="Amos"/><br /><sub><b>Amos</b></sub></a><br /><a href="https://github.com/fluttercandies/flutter_wechat_camera_picker/issues?q=author%3AAmosHuKe" title="Bug reports">🐛</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/yujune"><img src="https://avatars.githubusercontent.com/u/56582497?v=4?s=50" width="50px;" alt="Tee Yu June"/><br /><sub><b>Tee Yu June</b></sub></a><br /><a href="https://github.com/fluttercandies/flutter_wechat_camera_picker/commits?author=yujune" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>