docs: update community link (#86)

Author: ilhan007

README.md

@@ -84,7 +84,7 @@ No limitations known.
 No major bugs known.
 
 ## Support
-We welcome all comments, suggestions, questions, and bug reports. Please follow our [Support Guidelines](https://github.com/SAP/ui5-webcomponents/blob/master/SUPPORT.md#-content) on how to report an issue, or chat with us in the `#webcomponents` channel of the [OpenUI5 Community Slack](https://join-ui5-slack.herokuapp.com/).
+We welcome all comments, suggestions, questions, and bug reports. Please follow our [Support Guidelines](https://github.com/SAP/ui5-webcomponents/blob/master/SUPPORT.md#-content) on how to report an issue, or chat with us in the `#webcomponents` channel of the [OpenUI5 Community Slack](https://ui5-slack-invite.cfapps.eu10.hana.ondemand.com/).
 
 ## Contribute to UI5 Web Components
 Please check our [Contribution Guidelines](https://github.com/SAP/ui5-webcomponents/blob/master/CONTRIBUTING.md).