docs: add ph-fritsche as a contributor (#896)

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -1320,6 +1320,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "ph-fritsche",
+      "name": "Philipp Fritsche",
+      "avatar_url": "https://avatars.githubusercontent.com/u/39068198?v=4",
+      "profile": "https://github.com/ph-fritsche",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "repoHost": "https://github.com"

README.md

@@ -304,6 +304,7 @@ Thanks goes to these people ([emoji key][emojis]):
   </tr>
   <tr>
     <td align="center"><a href="https://github.com/nathanforce"><img src="https://avatars2.githubusercontent.com/u/6694194?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Nathan Force</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=nathanforce" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/ph-fritsche"><img src="https://avatars.githubusercontent.com/u/39068198?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Philipp Fritsche</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=ph-fritsche" title="Code">💻</a></td>
   </tr>
 </table>