docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -3,7 +3,7 @@
 [![Build Status](https://travis-ci.org/dkarter/bullets.vim.svg?branch=master)](https://travis-ci.org/dkarter/bullets.vim) 
 
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-10-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-11-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 # Description
@@ -351,6 +351,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/mykoza"><img src="https://avatars1.githubusercontent.com/u/48719773?v=4" width="100px;" alt=""/><br /><sub><b>mykoza</b></sub></a><br /><a href="https://github.com/dkarter/bullets.vim/commits?author=mykoza" title="Code">💻</a> <a href="#ideas-mykoza" title="Ideas, Planning, & Feedback">🤔</a></td>
     <td align="center"><a href="https://github.com/noodlor"><img src="https://avatars3.githubusercontent.com/u/49209345?v=4" width="100px;" alt=""/><br /><sub><b>noodlor</b></sub></a><br /><a href="https://github.com/dkarter/bullets.vim/commits?author=noodlor" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/harshad1"><img src="https://avatars0.githubusercontent.com/u/1940940?v=4" width="100px;" alt=""/><br /><sub><b>Harshad Srinivasan</b></sub></a><br /><a href="https://github.com/dkarter/bullets.vim/commits?author=harshad1" title="Code">💻</a> <a href="https://github.com/dkarter/bullets.vim/issues?q=author%3Aharshad1" title="Bug reports">🐛</a></td>
+    <td align="center"><a href="https://erickchacon.github.io/"><img src="https://avatars2.githubusercontent.com/u/7862458?v=4" width="100px;" alt=""/><br /><sub><b>Erick A. Chacón Montalván</b></sub></a><br /><a href="#ideas-ErickChacon" title="Ideas, Planning, & Feedback">🤔</a></td>
   </tr>
 </table>