docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -1,6 +1,6 @@
 ![Code is Science Logo](static/images/logo.png)
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-8-orange.svg?style=flat-square)](#contributors)
+[![All Contributors](https://img.shields.io/badge/all_contributors-9-orange.svg?style=flat-square)](#contributors)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 [![Backers on Open Collective](https://opencollective.com/code-is-science/backers/badge.svg)](#backers)
@@ -50,6 +50,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
   </tr>
   <tr>
     <td align="center"><a href="http://twitter.com/emmy_ft"><img src="https://avatars1.githubusercontent.com/u/24935760?v=4" width="100px;" alt=""/><br /><sub><b>Emmy Tsang</b></sub></a></td>
+    <td align="center"><a href="https://github.com/helenapv"><img src="https://avatars2.githubusercontent.com/u/44844296?v=4" width="100px;" alt=""/><br /><sub><b>helenapv</b></sub></a></td>
   </tr>
 </table>