docs: add mdjastrzebski as a contributor (#633)

* docs: update README.md

* docs: update .all-contributorsrc

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

.all-contributorsrc

@@ -1047,6 +1047,15 @@
         "code",
         "test"
       ]
+    },
+    {
+      "login": "mdjastrzebski",
+      "name": "Maciej Jastrzebski",
+      "avatar_url": "https://avatars2.githubusercontent.com/u/6368606?v=4",
+      "profile": "https://github.com/mdjastrzebski",
+      "contributions": [
+        "bug"
+      ]
     }
   ],
   "repoHost": "https://github.com"

README.md

@@ -268,6 +268,7 @@ Thanks goes to these people ([emoji key][emojis]):
   </tr>
   <tr>
     <td align="center"><a href="https://github.com/tjefferson08"><img src="https://avatars2.githubusercontent.com/u/3535390?v=4" width="100px;" alt=""/><br /><sub><b>Travis Jefferson</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=tjefferson08" title="Code">💻</a> <a href="https://github.com/testing-library/dom-testing-library/commits?author=tjefferson08" title="Tests">⚠️</a></td>
+    <td align="center"><a href="https://github.com/mdjastrzebski"><img src="https://avatars2.githubusercontent.com/u/6368606?v=4" width="100px;" alt=""/><br /><sub><b>Maciej Jastrzebski</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/issues?q=author%3Amdjastrzebski" title="Bug reports">🐛</a></td>
   </tr>
 </table>