docs: add jennifer-shehane as a contributor (testing-library#252)

* docs: update README.md * docs: update .all-contributorsrc

Author: allcontributors[bot]

.all-contributorsrc

@@ -278,6 +278,15 @@
  "contributions": [
  "doc"
  ]
+ },
+ {
+ "login": "jennifer-shehane",
+ "name": "Jennifer Shehane",
+ "avatar_url": "https://avatars1.githubusercontent.com/u/1271364?v=4",
+ "profile": "https://github.com/jennifer-shehane",
+ "contributions": [
+ "doc"
+ ]
  }
  ],
  "contributorsPerLine": 7,

README.md

@@ -72,6 +72,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
  <tr>
  <td align="center"><a href="http://eugielimpin.com"><img src="https://avatars3.githubusercontent.com/u/431442?v=4" width="100px;" alt="Eugie Limpin"/><br /><sub><b>Eugie Limpin</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=eugiellimpin" title="Documentation">📖</a></td>
  <td align="center"><a href="https://hsiangyu.com"><img src="https://avatars3.githubusercontent.com/u/7204070?v=4" width="100px;" alt="Kevin"/><br /><sub><b>Kevin</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=KevinHu2014" title="Documentation">📖</a></td>
+ <td align="center"><a href="https://github.com/jennifer-shehane"><img src="https://avatars1.githubusercontent.com/u/1271364?v=4" width="100px;" alt="Jennifer Shehane"/><br /><sub><b>Jennifer Shehane</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=jennifer-shehane" title="Documentation">📖</a></td>
  </tr>
 </table>