Update README.md - add slack link

README.md

@@ -17,9 +17,10 @@
 <a href="LICENSE"><img src="https://img.shields.io/badge/License-MIT-yellow.svg" alt="License: MIT"></a>
 [![donate](https://brianmacdonald.github.io/Ethonate/svg/eth-donate-blue.svg)](https://brianmacdonald.github.io/Ethonate/address#0xf4a759C9436E2280Ea9cdd23d3144D95538fF4bE)
 <a target="_blank" href="https://twitter.com/kerberosio?ref_src=twsrc%5Etfw"><img src="https://img.shields.io/twitter/url.svg?label=Follow%20%40kerberosio&style=social&url=https%3A%2F%2Ftwitter.com%2Fkerberosio" alt="Twitter Widget"></a>
-[![Discord Shield](https://discordapp.com/api/guilds/1039619181731135499/widget.png?style=shield)](https://discord.gg/Bj77Vqfp2G)
 [![kerberosio](https://snapcraft.io/kerberosio/badge.svg)](https://snapcraft.io/kerberosio)
 
+[![Slack invite](https://img.shields.io/badge/join%20kerberos.io%20on%20slack-grey?style=for-the-badge&logo=slack)](https://joinslack.kerberos.io/)
+
 [**Docker Hub**](https://hub.docker.com/r/kerberos/agent) | [**Documentation**](https://doc.kerberos.io) | [**Website**](https://kerberos.io) | [**View Demo**](https://demo.kerberos.io)
 
 Kerberos Agent is an isolated and scalable video (surveillance) management agent made available as Open Source under the MIT License. This means that all the source code is available for you or your company, and you can use, transform and distribute the source code; as long you keep a reference of the original license. Kerberos Agent can be used for commercial usage (which was not the case for v2). Read more [about the license here](LICENSE).