docs: add DylanModesitt as a contributor for code (#3684)

* 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

@@ -566,6 +566,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "DylanModesitt",
+      "name": "Dylan Modesitt",
+      "avatar_url": "https://avatars.githubusercontent.com/u/8339189?v=4",
+      "profile": "http://dylanmodesitt.com/",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -245,6 +245,7 @@ Thanks especially to the gracious help of Awkward Array contributors (including
       <td align="center" valign="top" width="14.28%"><a href="https://apn-pucky.github.io/"><img src="https://avatars.githubusercontent.com/u/4533248?v=4?s=100" width="100px;" alt="Alexander Puck Neuwirth"/><br /><sub><b>Alexander Puck Neuwirth</b></sub></a><br /><a href="https://github.com/scikit-hep/awkward/commits?author=APN-Pucky" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/nileshpatra"><img src="https://avatars.githubusercontent.com/u/37436956?v=4?s=100" width="100px;" alt="Nilesh Patra"/><br /><sub><b>Nilesh Patra</b></sub></a><br /><a href="https://github.com/scikit-hep/awkward/commits?author=nileshpatra" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/TaiSakuma"><img src="https://avatars.githubusercontent.com/u/1388081?v=4?s=100" width="100px;" alt="Tai Sakuma"/><br /><sub><b>Tai Sakuma</b></sub></a><br /><a href="https://github.com/scikit-hep/awkward/commits?author=TaiSakuma" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="http://dylanmodesitt.com/"><img src="https://avatars.githubusercontent.com/u/8339189?v=4?s=100" width="100px;" alt="Dylan Modesitt"/><br /><sub><b>Dylan Modesitt</b></sub></a><br /><a href="https://github.com/scikit-hep/awkward/commits?author=DylanModesitt" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>