Update README.md

README.md

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 <br>Project status details:<br>
 [![Build Travis CI Master](https://travis-ci.org/blabla1337/skf-flask.svg?branch=master)](https://travis-ci.org/blabla1337/skf-flask)
 [![Join the chat at https://gitter.im/Security-Knowledge-Framework/Lobby](https://badges.gitter.im/Security-Knowledge-Framework/Lobby.svg)](https://gitter.im/Security-Knowledge-Framework/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-[![Join the chat at https://img.shields.io/badge/slack-@OWASP-SKF/npp-yellow.svg?logo=slack)](https://owasp.slack.com/messages/C0F7L9X6V)
+
+[![Join the chat at https://owasp.slack.com/messages/C0F7L9X6V](https://img.shields.io/badge/chat-on%20slack-blueviolet)](https://owasp.slack.com/messages/C0F7L9X6V)
+
 [![OWASP Flagship](https://img.shields.io/badge/owasp-flagship%20project-orange.svg)](https://www.owasp.org/index.php/OWASP_Security_Knowledge_Framework)
 
 <br>Quality testing:<br>