docs: add khitrenovich as a contributor for doc (testing-library#1145)

Author: allcontributors[bot]

.all-contributorsrc

@@ -2132,6 +2132,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "khitrenovich",
+      "name": "Anton Khitrenovich",
+      "avatar_url": "https://avatars.githubusercontent.com/u/3424762?v=4",
+      "profile": "http://technotes.khitrenovich.com/",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -436,6 +436,7 @@ Thanks goes to these wonderful people
     <td align="center"><a href="https://github.com/mdjastrzebski"><img src="https://avatars.githubusercontent.com/u/6368606?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Maciej Jastrzebski</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=mdjastrzebski" title="Documentation">📖</a></td>
     <td align="center"><a href="https://semoal.github.io/sergiomoreno/"><img src="https://avatars.githubusercontent.com/u/22656541?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Sergio Moreno</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=semoal" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/davidnixon"><img src="https://avatars.githubusercontent.com/u/7536103?v=4?s=100" width="100px;" alt=""/><br /><sub><b>David Nixon</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=davidnixon" title="Documentation">📖</a></td>
+    <td align="center"><a href="http://technotes.khitrenovich.com/"><img src="https://avatars.githubusercontent.com/u/3424762?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Anton Khitrenovich</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=khitrenovich" title="Documentation">📖</a></td>
   </tr>
 </table>