docs: add PM6 as a contributor for code (#303)

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -601,6 +601,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "PM6",
+      "name": "PM6",
+      "avatar_url": "https://avatars.githubusercontent.com/u/12296209?v=4",
+      "profile": "https://github.com/PM6",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -367,6 +367,7 @@ Thanks goes to these wonderful people
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/kmccoan"><img src="https://avatars.githubusercontent.com/u/4242047?v=4?s=100" width="100px;" alt="kmccoan"/><br /><sub><b>kmccoan</b></sub></a><br /><a href="https://github.com/kentcdodds/bookshelf/commits?author=kmccoan" title="Documentation">📖</a></td>
       <td align="center" valign="top" width="14.28%"><a href="http://ehsan.tatasadi.com"><img src="https://avatars.githubusercontent.com/u/18641021?v=4?s=100" width="100px;" alt="Ehsan Tatasadi"/><br /><sub><b>Ehsan Tatasadi</b></sub></a><br /><a href="https://github.com/kentcdodds/bookshelf/commits?author=tatasadi" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/PM6"><img src="https://avatars.githubusercontent.com/u/12296209?v=4?s=100" width="100px;" alt="PM6"/><br /><sub><b>PM6</b></sub></a><br /><a href="https://github.com/kentcdodds/bookshelf/commits?author=PM6" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>