Update Slack invite link

Author: J12934

README.md

@@ -199,5 +199,5 @@ Sponsored by [iteratec GmbH](https://www.iteratec.de/) - [secureCodeBox.io](http
 [scb-github]: https://github.com/secureCodeBox/
 [scb-engine]: https://github.com/secureCodeBox/engine
 [scb-twitter]: https://twitter.com/secureCodeBox
-[scb-slack]: https://join.slack.com/t/securecodebox/shared_invite/enQtNDU3MTUyOTM0NTMwLTJiNzg3MmU2ZDY2NDFiMGI0Y2FkM2I5Mzc2ZmEzYTcyN2FlN2Y2NDFiZDE5NjAxMjg1M2IxNDViNzE3OTIxMGU
+[scb-slack]: https://join.slack.com/t/securecodebox/shared_invite/enQtNDU3MTUyOTM0NTMwLTBjOWRjNjVkNGEyMjQ0ZGMyNDdlYTQxYWQ4MzNiNGY3MDMxNThkZjJmMzY2NDRhMTk3ZWM3OWFkYmY1YzUxNTU
 [scb-license]: https://github.com/secureCodeBox/secureCodeBox/blob/master/LICENSE