docs: add stefanv as a contributor for code, review, and design (#166)

* 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

@@ -49,6 +49,17 @@
         "review",
         "design"
       ]
+    },
+    {
+      "login": "stefanv",
+      "name": "Stefan van der Walt",
+      "avatar_url": "https://avatars.githubusercontent.com/u/45071?v=4",
+      "profile": "https://mentat.za.net",
+      "contributions": [
+        "code",
+        "review",
+        "design"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -1,6 +1,6 @@
 # <img src="images/logo/logo.png" width=40 /> pyOpenSci Peer Review Guide
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-4-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-5-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 ![GitHub release (latest by date)](https://img.shields.io/github/v/release/pyopensci/peer-review-guide?color=purple&display_name=tag&style=plastic)
@@ -94,6 +94,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
       <td align="center" valign="top" width="14.28%"><a href="http://arianesasso.me"><img src="https://avatars.githubusercontent.com/u/3659681?v=4?s=100" width="100px;" alt="Ariane Sasso"/><br /><sub><b>Ariane Sasso</b></sub></a><br /><a href="https://github.com/pyOpenSci/software-peer-review/commits?author=arianesasso" title="Code">💻</a> <a href="https://github.com/pyOpenSci/software-peer-review/pulls?q=is%3Apr+reviewed-by%3Aarianesasso" title="Reviewed Pull Requests">👀</a> <a href="#design-arianesasso" title="Design">🎨</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/rabernat"><img src="https://avatars.githubusercontent.com/u/1197350?v=4?s=100" width="100px;" alt="Ryan Abernathey"/><br /><sub><b>Ryan Abernathey</b></sub></a><br /><a href="https://github.com/pyOpenSci/software-peer-review/commits?author=rabernat" title="Code">💻</a> <a href="#design-rabernat" title="Design">🎨</a> <a href="https://github.com/pyOpenSci/software-peer-review/pulls?q=is%3Apr+reviewed-by%3Arabernat" title="Reviewed Pull Requests">👀</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://nicholdav.info/"><img src="https://avatars.githubusercontent.com/u/11934090?v=4?s=100" width="100px;" alt="David Nicholson"/><br /><sub><b>David Nicholson</b></sub></a><br /><a href="https://github.com/pyOpenSci/software-peer-review/commits?author=NickleDave" title="Code">💻</a> <a href="https://github.com/pyOpenSci/software-peer-review/pulls?q=is%3Apr+reviewed-by%3ANickleDave" title="Reviewed Pull Requests">👀</a> <a href="#design-NickleDave" title="Design">🎨</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://mentat.za.net"><img src="https://avatars.githubusercontent.com/u/45071?v=4?s=100" width="100px;" alt="Stefan van der Walt"/><br /><sub><b>Stefan van der Walt</b></sub></a><br /><a href="https://github.com/pyOpenSci/software-peer-review/commits?author=stefanv" title="Code">💻</a> <a href="https://github.com/pyOpenSci/software-peer-review/pulls?q=is%3Apr+reviewed-by%3Astefanv" title="Reviewed Pull Requests">👀</a> <a href="#design-stefanv" title="Design">🎨</a></td>
     </tr>
   </tbody>
 </table>