docs: add kevinsmia1939 as a contributor for doc (#259)

* docs: update README.md [skip ci]

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

* docs: update README.md [skip ci]

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

* Update README.md

---------

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -216,7 +216,8 @@
       "avatar_url": "https://avatars.githubusercontent.com/u/11407922?v=4",
       "profile": "https://github.com/kevinsmia1939",
       "contributions": [
-        "code"
+        "code",
+        "doc"
       ]
     }
   ],

README.md

@@ -99,7 +99,7 @@ This project started at the [2018 Electrochemical Society (ECS) Hack Week in Sea
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/pililac"><img src="https://avatars.githubusercontent.com/u/60116646?v=4?s=100" width="100px;" alt="pililac"/><br /><sub><b>pililac</b></sub></a><br /><a href="https://github.com/ECSHackWeek/impedance.py/issues?q=author%3Apililac" title="Bug reports">🐛</a></td>
     </tr>
     <tr>
-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/kevinsmia1939"><img src="https://avatars.githubusercontent.com/u/11407922?v=4?s=100" width="100px;" alt="Kavin Teenakul"/><br /><sub><b>Kavin Teenakul</b></sub></a><br /><a href="https://github.com/ECSHackWeek/impedance.py/commits?author=kevinsmia1939" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/kevinsmia1939"><img src="https://avatars.githubusercontent.com/u/11407922?v=4?s=100" width="100px;" alt="Kavin Teenakul"/><br /><sub><b>Kavin Teenakul</b></sub></a><br /><a href="https://github.com/ECSHackWeek/impedance.py/commits?author=kevinsmia1939" title="Code">💻</a> <a href="https://github.com/ECSHackWeek/impedance.py/commits?author=kevinsmia1939" title="Documentation">📖</a>
     </tr>
   </tbody>
 </table>