add Alan-Collins as a contributor for code (#1108)

* update README.md [skip ci]

* update .all-contributorsrc [skip ci]

---------

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -1124,6 +1124,15 @@
       "contributions": [
         "bug"
       ]
+    },
+    {
+      "login": "Alan-Collins",
+      "name": "Alan Collins",
+      "avatar_url": "https://avatars.githubusercontent.com/u/38288262?v=4",
+      "profile": "https://www.linkedin.com/in/alan-collins/",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -272,6 +272,7 @@ This library could only exist thanks to the dedication of many volunteers around
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/valholl"><img src="https://avatars.githubusercontent.com/u/301204?v=4?s=100" width="100px;" alt="Elena ``of Valhalla''"/><br /><sub><b>Elena ``of Valhalla''</b></sub></a><br /><a href="https://github.com/py-pdf/fpdf2/commits?author=valholl" title="Tests">⚠️</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/nocalla"><img src="https://avatars.githubusercontent.com/u/16230431?v=4?s=100" width="100px;" alt="Niall O'Callaghan"/><br /><sub><b>Niall O'Callaghan</b></sub></a><br /><a href="https://github.com/py-pdf/fpdf2/issues?q=author%3Anocalla" title="Bug reports">🐛</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/jsid72"><img src="https://avatars.githubusercontent.com/u/51690199?v=4?s=100" width="100px;" alt="jsid72"/><br /><sub><b>jsid72</b></sub></a><br /><a href="https://github.com/py-pdf/fpdf2/issues?q=author%3Ajsid72" title="Bug reports">🐛</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://www.linkedin.com/in/alan-collins/"><img src="https://avatars.githubusercontent.com/u/38288262?v=4?s=100" width="100px;" alt="Alan Collins"/><br /><sub><b>Alan Collins</b></sub></a><br /><a href="https://github.com/py-pdf/fpdf2/commits?author=Alan-Collins" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>