docs: add yinm as a contributor for code (#1269)

* docs: update README.md

* docs: update .all-contributorsrc

---------

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

.all-contributorsrc

@@ -1353,6 +1353,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "yinm",
+      "name": "Yusuke Iinuma",
+      "avatar_url": "https://avatars.githubusercontent.com/u/13295106?v=4",
+      "profile": "http://yinm.info",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -630,6 +630,7 @@ Thanks goes to these people ([emoji key][emojis]):
     </tr>
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="http://cmdcolin.github.io"><img src="https://avatars.githubusercontent.com/u/6511937?v=4?s=100" width="100px;" alt="Colin Diesh"/><br /><sub><b>Colin Diesh</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/commits?author=cmdcolin" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="http://yinm.info"><img src="https://avatars.githubusercontent.com/u/13295106?v=4?s=100" width="100px;" alt="Yusuke Iinuma"/><br /><sub><b>Yusuke Iinuma</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/commits?author=yinm" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>