docs: add vianxnguyen as a contributor for code, doc, and 2 more (#265)

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

.all-contributorsrc

@@ -330,6 +330,18 @@
         "code",
         "doc"
       ]
+    },
+    {
+      "login": "vianxnguyen",
+      "name": "vivian",
+      "avatar_url": "https://avatars.githubusercontent.com/u/46759999?v=4",
+      "profile": "https://github.com/vianxnguyen",
+      "contributions": [
+        "code",
+        "doc",
+        "example",
+        "ideas"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -1,6 +1,6 @@
 # [ConvoKit](http://convokit.cornell.edu/)
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-32-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-33-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 [![pypi](https://img.shields.io/pypi/v/convokit.svg)](https://pypi.org/pypi/convokit/)
@@ -281,6 +281,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
       <td align="center" valign="top" width="14.28%"><a href="http://justin-cho.com"><img src="https://avatars.githubusercontent.com/u/31977186?v=4?s=100" width="100px;" alt="Justin Cho"/><br /><sub><b>Justin Cho</b></sub></a><br /><a href="#data-wise-east" title="Data">🔣</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/seanzhangkx8"><img src="https://avatars.githubusercontent.com/u/106214464?v=4?s=100" width="100px;" alt="seanzhangkx8"/><br /><sub><b>seanzhangkx8</b></sub></a><br /><a href="https://github.com/CornellNLP/ConvoKit/commits?author=seanzhangkx8" title="Code">💻</a> <a href="#ideas-seanzhangkx8" title="Ideas, Planning, & Feedback">🤔</a> <a href="#maintenance-seanzhangkx8" title="Maintenance">🚧</a> <a href="https://github.com/CornellNLP/ConvoKit/commits?author=seanzhangkx8" title="Documentation">📖</a> <a href="https://github.com/CornellNLP/ConvoKit/pulls?q=is%3Apr+reviewed-by%3Aseanzhangkx8" title="Reviewed Pull Requests">👀</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/ethanxia4"><img src="https://avatars.githubusercontent.com/u/96800594?v=4?s=100" width="100px;" alt="Ethan Xia"/><br /><sub><b>Ethan Xia</b></sub></a><br /><a href="https://github.com/CornellNLP/ConvoKit/commits?author=ethanxia4" title="Code">💻</a> <a href="https://github.com/CornellNLP/ConvoKit/commits?author=ethanxia4" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/vianxnguyen"><img src="https://avatars.githubusercontent.com/u/46759999?v=4?s=100" width="100px;" alt="vivian"/><br /><sub><b>vivian</b></sub></a><br /><a href="https://github.com/CornellNLP/ConvoKit/commits?author=vianxnguyen" title="Code">💻</a> <a href="https://github.com/CornellNLP/ConvoKit/commits?author=vianxnguyen" title="Documentation">📖</a> <a href="#example-vianxnguyen" title="Examples">💡</a> <a href="#ideas-vianxnguyen" title="Ideas, Planning, & Feedback">🤔</a></td>
     </tr>
   </tbody>
 </table>