docs: add dfoverdx as a contributor for code (#1029)

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -1434,6 +1434,15 @@
         "code",
         "test"
       ]
+    },
+    {
+      "login": "dfoverdx",
+      "name": "Beth Hitch",
+      "avatar_url": "https://avatars.githubusercontent.com/u/3087358?v=4",
+      "profile": "http://dfdx.us",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "repoHost": "https://github.com"

README.md

@@ -318,6 +318,7 @@ Thanks goes to these people ([emoji key][emojis]):
     <td align="center"><a href="https://github.com/riotrah"><img src="https://avatars.githubusercontent.com/u/22646419?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Rayat Rahman</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=riotrah" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/savcni01"><img src="https://avatars.githubusercontent.com/u/18025894?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Nik Savchenko</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=savcni01" title="Code">💻</a></td>
     <td align="center"><a href="http://www.hawkeye.dog"><img src="https://avatars.githubusercontent.com/u/7245931?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Kevin Fleischman</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=istateside" title="Code">💻</a> <a href="https://github.com/testing-library/dom-testing-library/commits?author=istateside" title="Tests">⚠️</a></td>
+    <td align="center"><a href="http://dfdx.us"><img src="https://avatars.githubusercontent.com/u/3087358?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Beth Hitch</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=dfoverdx" title="Code">💻</a></td>
   </tr>
 </table>