Update README.md

Author: Richard Waller

README.md

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 # OpenAPI Validators
 
 [![Build Status](https://travis-ci.com/openapi-library/OpenAPIValidators.svg?branch=master)](https://travis-ci.com/openapi-library/OpenAPIValidators)
-![dependencies](https://img.shields.io/david/openapi-library/OpenAPIValidators)
 ![style](https://img.shields.io/badge/code%20style-airbnb-ff5a5f.svg)
 [![codecov](https://codecov.io/gh/openapi-library/OpenAPIValidators/branch/master/graph/badge.svg)](https://codecov.io/gh/openapi-library/OpenAPIValidators)
 [![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](https://github.com/openapi-library/OpenAPIValidators/blob/master/CONTRIBUTING.md)