docs: update README.md

README.md

@@ -1,4 +1,5 @@
 # express-openapi-validator
+[![All Contributors](https://img.shields.io/badge/all_contributors-1-orange.svg?style=flat-square)](#contributors)
 
 [![](https://travis-ci.org/cdimascio/express-openapi-validator.svg?branch=master)](#) [![](https://img.shields.io/npm/v/express-openapi-validator.svg)](https://www.npmjs.com/package/express-openapi-validator) [![Coverage Status](https://coveralls.io/repos/github/cdimascio/express-openapi-validator/badge.svg)](https://coveralls.io/github/cdimascio/express-openapi-validator) [![](https://img.shields.io/badge/license-MIT-blue.svg)](#license)
 
@@ -238,3 +239,19 @@ curl -XPOST http://localhost:3000/v1/pets/10/photos -F [email protected] | jq
 ## License
 
 [MIT](LICENSE)
+
+## 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://www.twitter.com/carminedimascio"><img src="https://avatars1.githubusercontent.com/u/4706618?v=4" width="100px;" alt="Carmine DiMascio"/><br /><sub><b>Carmine DiMascio</b></sub></a><br /><a href="https://github.com/cdimascio/express-openapi-validator/commits?author=cdimascio" title="Code">💻</a> <a href="https://github.com/cdimascio/express-openapi-validator/commits?author=cdimascio" title="Tests">⚠️</a> <a href="#infra-cdimascio" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</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!