docs: add aaronraff as a contributor (#150)

* docs: update README.md

* docs: create .all-contributorsrc

* Update README.md

.all-contributorsrc

@@ -0,0 +1,23 @@
+{
+  "files": [
+    "README.md"
+  ],
+  "imageSize": 100,
+  "commit": false,
+  "contributors": [
+    {
+      "login": "aaronraff",
+      "name": "Aaron Raff",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/16910064?v=4",
+      "profile": "http://aaronraff.github.io",
+      "contributions": [
+        "code"
+      ]
+    }
+  ],
+  "contributorsPerLine": 7,
+  "projectName": "flipt",
+  "projectOwner": "markphelps",
+  "repoType": "github",
+  "repoHost": "https://github.com"
+}

README.md

@@ -171,3 +171,19 @@ If you or your organization would like to help beta test a Pro version of Flipt,
 
 * Twitter: [@mark_a_phelps](https://twitter.com/mark_a_phelps)
 * Email: _mark.aaron.phelps at gmail.com_
+
+## Contributors ✨
+
+Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):
+
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+<!-- prettier-ignore -->
+<table>
+  <tr>
+    <td align="center"><a href="http://aaronraff.github.io"><img src="https://avatars0.githubusercontent.com/u/16910064?v=4" width="100px;" alt="Aaron Raff"/><br /><sub><b>Aaron Raff</b></sub></a><br /><a href="https://github.com/markphelps/flipt/commits?author=aaronraff" title="Code">💻</a></td>
+  </tr>
+</table>
+
+<!-- ALL-CONTRIBUTORS-LIST:END -->
+
+This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!