Update Slack chat room link in README

Author: DrSatyr

README.md

@@ -8,7 +8,7 @@ Compare two OpenAPI specifications (3.x) and render the difference to HTML plain
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-[![Join the Slack chat room](https://img.shields.io/badge/Slack-Join%20the%20chat%20room-orange)](https://join.slack.com/t/openapi-generator/shared_invite/zt-12jxxd7p2-XUeQM~4pzsU9x~eGLQqX2g)
+[![Join the Slack chat room](https://img.shields.io/badge/Slack-Join%20the%20chat%20room-orange)](https://join.slack.com/t/openapi-generator/shared_invite/zt-36ucx4ybl-jYrN6euoYn6zxXNZdldoZA)
 
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