docs: add sparrowt as a contributor for bug (#957)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

---------

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -278,6 +278,15 @@
       "contributions": [
         "test"
       ]
+    },
+    {
+      "login": "sparrowt",
+      "name": "Tom Sparrow",
+      "avatar_url": "https://avatars.githubusercontent.com/u/793763?v=4",
+      "profile": "http://about.me/tomsparrow",
+      "contributions": [
+        "bug"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -558,6 +558,7 @@ To develop locally, clone this repository and run `. script/bootstrap` to instal
     </tr>
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/epenet"><img src="https://avatars.githubusercontent.com/u/6771947?v=4?s=100" width="100px;" alt="epenet"/><br /><sub><b>epenet</b></sub></a><br /><a href="https://github.com/syrupy-project/syrupy/commits?author=epenet" title="Tests">⚠️</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="http://about.me/tomsparrow"><img src="https://avatars.githubusercontent.com/u/793763?v=4?s=100" width="100px;" alt="Tom Sparrow"/><br /><sub><b>Tom Sparrow</b></sub></a><br /><a href="https://github.com/syrupy-project/syrupy/issues?q=author%3Asparrowt" title="Bug reports">🐛</a></td>
     </tr>
   </tbody>
 </table>