docs: add AbhishekChaudharii as a contributor for test (#4467)

* docs: update all_contributors.md [skip ci]

* docs: update README.md [skip ci]

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

---------

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

.all-contributorsrc

@@ -747,7 +747,8 @@
       "profile": "https://github.com/AbhishekChaudharii",
       "contributions": [
         "doc",
-        "code"
+        "code",
+        "test"
       ]
     },
     {

all_contributors.md

@@ -91,7 +91,7 @@ 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/Agnik7"><img src="https://avatars.githubusercontent.com/u/77234005?v=4?s=100" width="100px;" alt="Agnik Bakshi"/><br /><sub><b>Agnik Bakshi</b></sub></a><br /><a href="https://github.com/pybamm-team/PyBaMM/commits?author=Agnik7" title="Documentation">📖</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/RuiheLi"><img src="https://avatars.githubusercontent.com/u/84007676?v=4?s=100" width="100px;" alt="RuiheLi"/><br /><sub><b>RuiheLi</b></sub></a><br /><a href="https://github.com/pybamm-team/PyBaMM/commits?author=RuiheLi" title="Code">💻</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=RuiheLi" title="Tests">⚠️</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/chmabaur"><img src="https://avatars.githubusercontent.com/u/127507466?v=4?s=100" width="100px;" alt="chmabaur"/><br /><sub><b>chmabaur</b></sub></a><br /><a href="https://github.com/pybamm-team/PyBaMM/issues?q=author%3Achmabaur" title="Bug reports">🐛</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=chmabaur" title="Code">💻</a></td>
-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/AbhishekChaudharii"><img src="https://avatars.githubusercontent.com/u/91185083?v=4?s=100" width="100px;" alt="Abhishek Chaudhari"/><br /><sub><b>Abhishek Chaudhari</b></sub></a><br /><a href="https://github.com/pybamm-team/PyBaMM/commits?author=AbhishekChaudharii" title="Documentation">📖</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=AbhishekChaudharii" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/AbhishekChaudharii"><img src="https://avatars.githubusercontent.com/u/91185083?v=4?s=100" width="100px;" alt="Abhishek Chaudhari"/><br /><sub><b>Abhishek Chaudhari</b></sub></a><br /><a href="https://github.com/pybamm-team/PyBaMM/commits?author=AbhishekChaudharii" title="Documentation">📖</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=AbhishekChaudharii" title="Code">💻</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=AbhishekChaudharii" title="Tests">⚠️</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/shubhambhar007"><img src="https://avatars.githubusercontent.com/u/32607282?v=4?s=100" width="100px;" alt="Shubham Bhardwaj"/><br /><sub><b>Shubham Bhardwaj</b></sub></a><br /><a href="#infra-shubhambhar007" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/jlauber18"><img src="https://avatars.githubusercontent.com/u/28939653?v=4?s=100" width="100px;" alt="Jonathan Lauber"/><br /><sub><b>Jonathan Lauber</b></sub></a><br /><a href="#infra-jlauber18" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
     </tr>