docs: add elikling as a contributor for doc (#540)

* docs: update CONTRIBUTING.md [skip ci]

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

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

.all-contributorsrc

@@ -145,6 +145,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "elikling",
+      "name": "Eli Y. Kling",
+      "avatar_url": "https://avatars.githubusercontent.com/u/8556526?v=4",
+      "profile": "https://github.com/elikling",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,

CONTRIBUTING.md

@@ -1,6 +1,6 @@
 
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-15-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-16-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 ## Contributors ✨
@@ -31,6 +31,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
   </tr>
   <tr>
     <td align="center"><a href="https://github.com/itsoum"><img src="https://avatars.githubusercontent.com/u/9675299?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ilias Tsoumas</b></sub></a><br /><a href="https://github.com/py-why/dowhy/commits?author=itsoum" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/elikling"><img src="https://avatars.githubusercontent.com/u/8556526?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Eli Y. Kling</b></sub></a><br /><a href="https://github.com/py-why/dowhy/commits?author=elikling" title="Documentation">📖</a></td>
   </tr>
 </table>