docs: add HillLiu as a contributor for bug (#1023)

Author: ph-fritsche

.all-contributorsrc

@@ -1388,6 +1388,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "HillLiu",
+      "name": "Hill Liu",
+      "avatar_url": "https://avatars.githubusercontent.com/u/1877738?v=4",
+      "profile": "https://github.com/pmvc/pmvc",
+      "contributions": [
+        "bug"
+      ]
     }
   ],
   "commitConvention": "none",

CONTRIBUTORS.md

@@ -191,6 +191,7 @@ Thanks goes to these wonderful people ([emoji key][emojis]):
     <td align="center"><a href="https://github.com/DGollings"><img src="https://avatars.githubusercontent.com/u/2032823?v=4?s=100" width="100px;" alt=""/><br /><sub><b>DGollings</b></sub></a><br /><a href="https://github.com/testing-library/user-event/issues?q=author%3ADGollings" title="Bug reports">🐛</a></td>
     <td align="center"><a href="https://github.com/sesam"><img src="https://avatars.githubusercontent.com/u/8921?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Simon B.</b></sub></a><br /><a href="https://github.com/testing-library/user-event/issues?q=author%3Asesam" title="Bug reports">🐛</a></td>
     <td align="center"><a href="http://kyliesy.com"><img src="https://avatars.githubusercontent.com/u/10233535?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Kylie Sy</b></sub></a><br /><a href="https://github.com/testing-library/user-event/commits?author=kksy" title="Documentation">📖</a></td>
+    <td align="center"><a href="https://github.com/pmvc/pmvc"><img src="https://avatars.githubusercontent.com/u/1877738?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Hill Liu</b></sub></a><br /><a href="https://github.com/testing-library/user-event/issues?q=author%3AHillLiu" title="Bug reports">🐛</a></td>
   </tr>
 </table>