docs: add benjaminmatthews as a contributor for doc (#305)

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

.all-contributorsrc

@@ -610,6 +610,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "benjaminmatthews",
+      "name": "benjaminmatthews",
+      "avatar_url": "https://avatars.githubusercontent.com/u/6886936?v=4",
+      "profile": "https://github.com/benjaminmatthews",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -368,6 +368,7 @@ Thanks goes to these wonderful people
       <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>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/benjaminmatthews"><img src="https://avatars.githubusercontent.com/u/6886936?v=4?s=100" width="100px;" alt="benjaminmatthews"/><br /><sub><b>benjaminmatthews</b></sub></a><br /><a href="https://github.com/kentcdodds/bookshelf/commits?author=benjaminmatthews" title="Documentation">📖</a></td>
     </tr>
   </tbody>
 </table>