docs: remove david-dm.org badge (#680)

alanshaw/david#179

Author: mariuspopaadrian

README.md

@@ -2,7 +2,6 @@
 
 [![GitHub Workflow Status (branch)](https://img.shields.io/github/workflow/status/chimurai/http-proxy-middleware/CI/master?style=flat-square)](https://github.com/chimurai/http-proxy-middleware/actions?query=branch%3Amaster)
 [![Coveralls](https://img.shields.io/coveralls/chimurai/http-proxy-middleware.svg?style=flat-square)](https://coveralls.io/r/chimurai/http-proxy-middleware)
-[![dependency Status](https://img.shields.io/david/chimurai/http-proxy-middleware.svg?style=flat-square)](https://david-dm.org/chimurai/http-proxy-middleware#info=dependencies)
 [![dependency Status](https://snyk.io/test/npm/http-proxy-middleware/badge.svg?style=flat-square)](https://snyk.io/test/npm/http-proxy-middleware)
 [![npm](https://img.shields.io/npm/v/http-proxy-middleware?color=%23CC3534&style=flat-square)](https://www.npmjs.com/package/http-proxy-middleware)