Update "join Slack" URL in README.md

Author: YevgeniyShunevych

README.md

@@ -3,7 +3,7 @@
 [![NuGet](http://img.shields.io/nuget/v/Atata.Configuration.Json.svg?style=flat)](https://www.nuget.org/packages/Atata.Configuration.Json/)
 [![GitHub release](https://img.shields.io/github/release/atata-framework/atata-configuration-json.svg)](https://github.com/atata-framework/atata-configuration-json/releases)
 [![Gitter](https://badges.gitter.im/atata-framework/atata-configuration-json.svg)](https://gitter.im/atata-framework/atata-configuration-json)
-[![Slack](https://img.shields.io/badge/join-Slack-green.svg?colorB=4EB898)](https://join.slack.com/t/atata-framework/shared_invite/enQtNDMzMzk3OTY5NjgzLTJlNzAyN2E3MzY3MDE4ZGE1ZDQzOGY2NThiYWExZTNkNDc5YjdlNzFjYmUwYjZmNDI2MDJlMGQ3ODNlMDljMzU)
+[![Slack](https://img.shields.io/badge/join-Slack-green.svg?colorB=4EB898)](https://join.slack.com/t/atata-framework/shared_invite/zt-5j3lyln7-WD1ZtMDzXBhPm0yXLDBzbA)
 [![Atata docs](https://img.shields.io/badge/docs-Atata_Framework-orange.svg)](https://atata.io)
 [![Twitter](https://img.shields.io/badge/[email protected])](https://twitter.com/AtataFramework)
 
@@ -438,4 +438,4 @@ or just mail to [email protected].
 ## License
 
 Atata is an open source software, licensed under the Apache License 2.0.
-See [LICENSE](LICENSE) for details.
+See [LICENSE](LICENSE) for details.