Replace travis badge

Author: thornjad

README.md

@@ -1,5 +1,5 @@
-[![build status](https://img.shields.io/travis/http-party/http-server.svg?style=flat-square)](https://travis-ci.org/http-party/http-server)
-[![npm](https://img.shields.io/npm/v/http-server.svg?style=flat-square)](https://www.npmjs.com/package/http-server) [![homebrew](https://img.shields.io/homebrew/v/http-server?style=flat-square)](https://formulae.brew.sh/formula/http-server) [![npm downloads](https://img.shields.io/npm/dm/http-server?color=blue&label=npm%20downloads&style=flat-square)](https://www.npmjs.com/package/http-server)
+![GitHub Workflow Status (master)](https://img.shields.io/github/workflow/status/http-party/http-server/Node.js%20CI/master?style=flat-square)
+[![npm](https://img.shields.io/npm/v/http-server.svg?style=flat-square)](https://www.npmjs.com/package/http-server) [![homebrew](https://img.shields.io/homebrew/v/http-server?style=flat-square)](https://formulae.brew.sh/formula/http-server) ![GitHub milestone](https://img.shields.io/github/milestones/progress-percent/http-party/http-server/4?label=next%20release%20progress&style=flat-square) [![npm downloads](https://img.shields.io/npm/dm/http-server?color=blue&label=npm%20downloads&style=flat-square)](https://www.npmjs.com/package/http-server)
 [![license](https://img.shields.io/github/license/http-party/http-server.svg?style=flat-square)](https://github.com/http-party/http-server)
 
 # http-server: a command-line http server