docs: add levenleven as a contributor for doc (#970)

Author: allcontributors[bot]

.all-contributorsrc

@@ -1672,6 +1672,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "levenleven",
+      "name": "Aleksey Levenstein",
+      "avatar_url": "https://avatars.githubusercontent.com/u/6463364?v=4",
+      "profile": "https://github.com/levenleven",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -375,6 +375,7 @@ Thanks goes to these wonderful people
   <tr>
     <td align="center"><a href="https://www.linkedin.com/in/jgsneves/"><img src="https://avatars.githubusercontent.com/u/48700146?v=4?s=100" width="100px;" alt=""/><br /><sub><b>JOAO GABRIEL SANTOS NEVES</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=jgsneves" title="Documentation">📖</a></td>
     <td align="center"><a href="http://lukeingalls.com"><img src="https://avatars.githubusercontent.com/u/45518011?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Luke Ingalls</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=lukeingalls" title="Documentation">📖</a></td>
+    <td align="center"><a href="https://github.com/levenleven"><img src="https://avatars.githubusercontent.com/u/6463364?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Aleksey Levenstein</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=levenleven" title="Documentation">📖</a></td>
   </tr>
 </table>