docs: add vadimshvetsov as a contributor (testing-library#280)

Author: allcontributors[bot]

.all-contributorsrc

@@ -281,6 +281,17 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "vadimshvetsov",
+      "name": "Vadim Shvetsov",
+      "avatar_url": "https://avatars2.githubusercontent.com/u/16336572?v=4",
+      "profile": "https://proling.ru/",
+      "contributions": [
+        "ideas",
+        "code",
+        "test"
+      ]
     }
   ],
   "commitConvention": "none",

README.md

@@ -335,11 +335,13 @@ Thanks goes to these wonderful people
     <td align="center"><a href="http://github.com/Raynos"><img src="https://avatars3.githubusercontent.com/u/479538?v=4" width="100px;" alt=""/><br /><sub><b>Jake Verbaten</b></sub></a><br /><a href="https://github.com/testing-library/user-event/commits?author=Raynos" title="Code">💻</a></td>
     <td align="center"><a href="https://skovy.dev"><img src="https://avatars1.githubusercontent.com/u/5247455?v=4" width="100px;" alt=""/><br /><sub><b>Spencer Miskoviak</b></sub></a><br /><a href="https://github.com/testing-library/user-event/commits?author=skovy" title="Documentation">📖</a></td>
   </tr>
+  <tr>
+    <td align="center"><a href="https://proling.ru/"><img src="https://avatars2.githubusercontent.com/u/16336572?v=4" width="100px;" alt=""/><br /><sub><b>Vadim Shvetsov</b></sub></a><br /><a href="#ideas-vadimshvetsov" title="Ideas, Planning, & Feedback">🤔</a> <a href="https://github.com/testing-library/user-event/commits?author=vadimshvetsov" title="Code">💻</a> <a href="https://github.com/testing-library/user-event/commits?author=vadimshvetsov" title="Tests">⚠️</a></td>
+  </tr>
 </table>
 
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-
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 This project follows the