Change colors of badge

Author: AVMatthews

README.md

@@ -90,6 +90,7 @@ You can use GitHub issues to [report a bug][bug-report] or [request a feature][f
 Need help? Join us on one of our community servers:
 
 * [![Discord][badge-discord]][yscope-community-discord]
+* [![Slack][badge-slack]][yscope-community-slack]
 * [![CLP on Zulip][badge-zulip]][yscope-community-zulip]
 
 # Next Steps
@@ -98,7 +99,7 @@ This is our open-source release which we will be constantly updating with bug fi
 If you would like a feature or want to report a bug, please file an issue and we'll be happy to engage.
 
 [badge-discord]: https://img.shields.io/discord/1377353873068392580?style=flat&logo=discord&logoColor=white&label=Discord&labelColor=%235561f5
-[badge-slack]: https://img.shields.io/badge/Slack-yscope--community-ECB22E?logo=slack&logoColor=white&labelColor=4A154B
+[badge-slack]: https://img.shields.io/badge/Slack-yscope--community-1e724f?style=flat&logo=slack&logoColor=white&labelColor=4A154B
 [badge-zulip]: https://img.shields.io/badge/Zulip-yscope--clp-1888FA?logo=zulip
 [bug-report]: https://github.com/y-scope/clp/issues/new?assignees=&labels=bug&template=bug-report.yml
 [build-package]: http://docs.yscope.com/clp/main/dev-docs/building-package