Update README.md

Author: BotellaA

README.md

@@ -19,8 +19,8 @@
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-  <a href="https://slackin-opengeode.herokuapp.com">
-    <img src="https://slackin-opengeode.herokuapp.com/badge.svg" alt="Slack invite">
+  <a href="https://opengeode-slack-invite.herokuapp.com">
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   <a href="https://doi.org/10.5281/zenodo.4427907">
     <img src="https://zenodo.org/badge/DOI/10.5281/zenodo.4427907.svg" alt="DOI">
@@ -46,4 +46,4 @@ Installing Geode-SimplexRemesh is done by using pip command ```pip install Geode
 
 For questions and support please use the official [slack](https://slackin-opengeode.herokuapp.com) and go to the channel #help. The issue list of this repo is exclusively for bug reports and feature requests. 
 
-Copyright (c) 2019 - 2021, Geode-solutions
+Copyright (c) 2019 - 2023, Geode-solutions