Refine badges

spectrum service is deprecated, migrate to use official github discussions

README.md

@@ -2,8 +2,8 @@
 
 [![Build Status](https://travis-ci.org/tngan/samlify.svg?branch=master)](https://travis-ci.org/tngan/samlify)
 [![npm version](https://img.shields.io/npm/v/samlify.svg?style=flat)](https://www.npmjs.com/package/samlify)
+[![NPM](https://img.shields.io/npm/dm/samlify.svg)](https://www.npmjs.com/package/samlify)
 [![Coverage Status](https://img.shields.io/coveralls/tngan/samlify/master.svg)](https://coveralls.io/github/tngan/samlify?branch=master)
-[![Join the community on Spectrum](https://withspectrum.github.io/badge/badge.svg)](https://spectrum.chat/samlify)
 
 Highly configuarable Node.js SAML 2.0 library for Single Sign On