docs: add gavinhow as a contributor for bug (#300)

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

.all-contributorsrc

@@ -284,6 +284,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "gavinhow",
+      "name": "gavinhow",
+      "avatar_url": "https://avatars.githubusercontent.com/u/16214376?v=4",
+      "profile": "https://github.com/gavinhow",
+      "contributions": [
+        "bug"
+      ]
     }
   ]
 }

README.md

@@ -458,6 +458,7 @@ manifest.json
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/wangxinyugithub"><img src="https://avatars.githubusercontent.com/u/39206932?v=4?s=50" width="50px;" alt="wangxy"/><br /><sub><b>wangxy</b></sub></a><br /><a href="#bug-wangxinyugithub" title="Bug reports">🐛</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/govza"><img src="https://avatars.githubusercontent.com/u/1425574?v=4?s=50" width="50px;" alt="Rasul"/><br /><sub><b>Rasul</b></sub></a><br /><a href="#doc-govza" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/gavinhow"><img src="https://avatars.githubusercontent.com/u/16214376?v=4?s=50" width="50px;" alt="gavinhow"/><br /><sub><b>gavinhow</b></sub></a><br /><a href="#bug-gavinhow" title="Bug reports">🐛</a></td>
     </tr>
   </tbody>
 </table>