docs: add kratman as a contributor for bug (#3354)

* 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

@@ -692,7 +692,8 @@
       "profile": "https://github.com/kratman",
       "contributions": [
         "doc",
-        "infra"
+        "infra",
+        "bug"
       ]
     }
   ],

README.md

@@ -14,7 +14,7 @@
 [![code style](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/charliermarsh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
 
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-62-orange.svg)](#-contributors)
+[![All Contributors](https://img.shields.io/badge/all_contributors-63-orange.svg)](#-contributors)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 </div>
@@ -264,7 +264,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/tommaull"><img src="https://avatars.githubusercontent.com/u/101814207?v=4?s=100" width="100px;" alt="Tom Maull"/><br /><sub><b>Tom Maull</b></sub></a><br /><a href="https://github.com/pybamm-team/PyBaMM/commits?author=tommaull" title="Code">💻</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=tommaull" title="Tests">⚠️</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/ejfdickinson"><img src="https://avatars.githubusercontent.com/u/116663050?v=4?s=100" width="100px;" alt="ejfdickinson"/><br /><sub><b>ejfdickinson</b></sub></a><br /><a href="#ideas-ejfdickinson" title="Ideas, Planning, & Feedback">🤔</a> <a href="https://github.com/pybamm-team/PyBaMM/issues?q=author%3Aejfdickinson" title="Bug reports">🐛</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/bobonice"><img src="https://avatars.githubusercontent.com/u/22030806?v=4?s=100" width="100px;" alt="bobonice"/><br /><sub><b>bobonice</b></sub></a><br /><a href="https://github.com/pybamm-team/PyBaMM/issues?q=author%3Abobonice" title="Bug reports">🐛</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=bobonice" title="Code">💻</a></td>
-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/kratman"><img src="https://avatars.githubusercontent.com/u/10170302?v=4?s=100" width="100px;" alt="Eric G. Kratz"/><br /><sub><b>Eric G. Kratz</b></sub></a><br /><a href="https://github.com/pybamm-team/PyBaMM/commits?author=kratman" title="Documentation">📖</a> <a href="#infra-kratman" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/kratman"><img src="https://avatars.githubusercontent.com/u/10170302?v=4?s=100" width="100px;" alt="Eric G. Kratz"/><br /><sub><b>Eric G. Kratz</b></sub></a><br /><a href="https://github.com/pybamm-team/PyBaMM/commits?author=kratman" title="Documentation">📖</a> <a href="#infra-kratman" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="https://github.com/pybamm-team/PyBaMM/issues?q=author%3Akratman" title="Bug reports">🐛</a></td>
     </tr>
   </tbody>
 </table>