docs: add jeffbernst as a contributor (#211)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com>

.all-contributorsrc

@@ -372,6 +372,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "jeffbernst",
+      "name": "Jeff Bernstein",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/6685560?v=4",
+      "profile": "http://jeffbernstein.io",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "repoHost": "https://github.com",

README.md

@@ -934,12 +934,12 @@ Thanks goes to these people ([emoji key][emojis]):
   <tr>
     <td align="center"><a href="https://jpblanco.dev"><img src="https://avatars1.githubusercontent.com/u/16567863?v=4" width="100px;" alt=""/><br /><sub><b>Juan Pablo Blanco</b></sub></a><br /><a href="https://github.com/testing-library/jest-dom/commits?author=JPBlancoDB" title="Documentation">📖</a></td>
     <td align="center"><a href="https://github.com/benmonro"><img src="https://avatars3.githubusercontent.com/u/399236?v=4" width="100px;" alt=""/><br /><sub><b>Ben Monro</b></sub></a><br /><a href="https://github.com/testing-library/jest-dom/commits?author=benmonro" title="Documentation">📖</a></td>
+    <td align="center"><a href="http://jeffbernstein.io"><img src="https://avatars1.githubusercontent.com/u/6685560?v=4" width="100px;" alt=""/><br /><sub><b>Jeff Bernstein</b></sub></a><br /><a href="https://github.com/testing-library/jest-dom/commits?author=jeffbernst" title="Documentation">📖</a></td>
   </tr>
 </table>
 
 <!-- markdownlint-enable -->
 <!-- prettier-ignore-end -->
-
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors][all-contributors] specification.