docs: add pgrimaud as a contributor (#559)

* docs: update README.md [skip ci]

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

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

.all-contributorsrc

@@ -592,6 +592,15 @@
         "bug",
         "example"
       ]
+    },
+    {
+      "login": "pgrimaud",
+      "name": "Pierre Grimaud",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/1866496?v=4",
+      "profile": "https://github.com/pgrimaud",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -151,6 +151,9 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/Miosame"><img src="https://avatars1.githubusercontent.com/u/8201077?v=4" width="100px;" alt=""/><br /><sub><b>miosame</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/commits?author=miosame" title="Documentation">📖</a></td>
     <td align="center"><a href="https://mtz.gr"><img src="https://avatars3.githubusercontent.com/u/590246?v=4" width="100px;" alt=""/><br /><sub><b>Andrew Metzger</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/issues?q=author%3Aandrewjmetzger" title="Bug reports">🐛</a> <a href="#example-andrewjmetzger" title="Examples">💡</a></td>
   </tr>
+  <tr>
+    <td align="center"><a href="https://github.com/pgrimaud"><img src="https://avatars1.githubusercontent.com/u/1866496?v=4" width="100px;" alt=""/><br /><sub><b>Pierre Grimaud</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/commits?author=pgrimaud" title="Documentation">📖</a></td>
+  </tr>
 </table>
 
 <!-- markdownlint-enable -->