docs: add wangxin688 as a contributor for code (#544)

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

.all-contributorsrc

@@ -400,6 +400,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "wangxin688",
+      "name": "jeffry",
+      "avatar_url": "https://avatars.githubusercontent.com/u/36665036?v=4",
+      "profile": "https://github.com/wangxin688",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -146,6 +146,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/hsorsky"><img src="https://avatars.githubusercontent.com/u/36887638?v=4?s=100" width="100px;" alt="Henry Sorsky"/><br /><sub><b>Henry Sorsky</b></sub></a><br /><a href="#infra-hsorsky" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/wer153"><img src="https://avatars.githubusercontent.com/u/23370765?v=4?s=100" width="100px;" alt="Kim Minki"/><br /><sub><b>Kim Minki</b></sub></a><br /><a href="https://github.com/litestar-org/polyfactory/commits?author=wer153" title="Documentation">📖</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://www.timdumol.com/"><img src="https://avatars.githubusercontent.com/u/49169?v=4?s=100" width="100px;" alt="Tim Joseph Dumol"/><br /><sub><b>Tim Joseph Dumol</b></sub></a><br /><a href="https://github.com/litestar-org/polyfactory/commits?author=TimDumol" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/wangxin688"><img src="https://avatars.githubusercontent.com/u/36665036?v=4?s=100" width="100px;" alt="jeffry"/><br /><sub><b>jeffry</b></sub></a><br /><a href="https://github.com/litestar-org/polyfactory/commits?author=wangxin688" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>