docs: add Snizhana as a contributor (#739)

* docs: update README.md

* docs: update .all-contributorsrc

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -1175,6 +1175,16 @@
         "code",
         "test"
       ]
+    },
+    {
+      "login": "Snizhana",
+      "name": "snizhana",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/18139946?v=4",
+      "profile": "https://github.com/Snizhana",
+      "contributions": [
+        "code",
+        "test"
+      ]
     }
   ],
   "repoHost": "https://github.com"

README.md

@@ -285,6 +285,9 @@ Thanks goes to these people ([emoji key][emojis]):
     <td align="center"><a href="https://github.com/maxnewlands"><img src="https://avatars3.githubusercontent.com/u/1304166?v=4" width="100px;" alt=""/><br /><sub><b>Maxwell Newlands</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=maxnewlands" title="Code">💻</a> <a href="https://github.com/testing-library/dom-testing-library/commits?author=maxnewlands" title="Tests">⚠️</a></td>
     <td align="center"><a href="http://www.jaredlux.com"><img src="https://avatars0.githubusercontent.com/u/450478?v=4" width="100px;" alt=""/><br /><sub><b>Jared Luxenberg</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=jluxenberg" title="Code">💻</a> <a href="https://github.com/testing-library/dom-testing-library/commits?author=jluxenberg" title="Tests">⚠️</a></td>
   </tr>
+  <tr>
+    <td align="center"><a href="https://github.com/Snizhana"><img src="https://avatars3.githubusercontent.com/u/18139946?v=4" width="100px;" alt=""/><br /><sub><b>snizhana</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=Snizhana" title="Code">💻</a> <a href="https://github.com/testing-library/dom-testing-library/commits?author=Snizhana" title="Tests">⚠️</a></td>
+  </tr>
 </table>
 
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