Update README.md

Author: arturbien

README.md

@@ -9,7 +9,7 @@
 <h3 align="center">
   <a href="https://arturbien.github.io/React95/?path=/story/select--fixed-width">Components</a> -
   <a href="https://react95.io/">Website</a> -
-  <a href="https://discord.gg/VfMmpPq">Discord Chat</a> -
+  <a href="https://join.slack.com/t/react95/shared_invite/enQtODExMzQ1Nzc2MjQ1LTMyNWVlYjllMzJhNTU3N2E2MDY1ZmM2ZTk3NzZkMjQ3YWIwMTlmNTZmMzc4OWU2MGVmYzZjMzNiNDI5NjgyMzA">Slack</a> -
   <a href="https://www.paypal.me/react95">PayPal donation 💰</a>
 </h3>
 <p align="center">