Update README.md

Author: SpliiT

README.md

@@ -19,7 +19,7 @@
   <!-- <img src="https://img.shields.io/badge/C%2B%2B-11-blue.svg" alt="Language">
   <img src="https://img.shields.io/badge/license-MIT-blue.svg" alt="License">
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-  <a href="https://opengeode-slack-invite.herokuapp.com">
+  <a href="https://geode-solutions.com/#slack">
     <img src="https://opengeode-slack-invite.herokuapp.com/badge.svg" alt="Slack invite">
   </a>
   <a href="https://doi.org/10.5281/zenodo.4427907">