docs: add pomber as a contributor (testing-library#264)

Author: allcontributors[bot]

.all-contributorsrc

@@ -254,6 +254,15 @@
       "contributions": [
         "review"
       ]
+    },
+    {
+      "login": "pomber",
+      "name": "Rodrigo Pombo",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/1911623?v=4",
+      "profile": "https://pomb.us",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "commitConvention": "none",

README.md

@@ -282,6 +282,7 @@ Thanks goes to these wonderful people
     <td align="center"><a href="https://twitter.com/wachunga"><img src="https://avatars0.githubusercontent.com/u/438545?v=4" width="100px;" alt=""/><br /><sub><b>David Hirtle</b></sub></a><br /><a href="https://github.com/testing-library/user-event/commits?author=wachunga" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/bdh1011"><img src="https://avatars2.githubusercontent.com/u/8446067?v=4" width="100px;" alt=""/><br /><sub><b>whiteUnicorn</b></sub></a><br /><a href="https://github.com/testing-library/user-event/commits?author=bdh1011" title="Code">💻</a></td>
     <td align="center"><a href="https://www.matej.snuderl.si/"><img src="https://avatars3.githubusercontent.com/u/8524109?v=4" width="100px;" alt=""/><br /><sub><b>Matej Šnuderl</b></sub></a><br /><a href="https://github.com/testing-library/user-event/pulls?q=is%3Apr+reviewed-by%3AMeemaw" title="Reviewed Pull Requests">👀</a></td>
+    <td align="center"><a href="https://pomb.us"><img src="https://avatars1.githubusercontent.com/u/1911623?v=4" width="100px;" alt=""/><br /><sub><b>Rodrigo Pombo</b></sub></a><br /><a href="https://github.com/testing-library/user-event/commits?author=pomber" title="Code">💻</a></td>
   </tr>
 </table>