[docs] Add Slack badge

README.md

@@ -13,6 +13,7 @@
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 **[Documentation](https://kstatemachine.github.io/kstatemachine) |
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@@ -218,7 +219,6 @@ See [CONTRIBUTING](./CONTRIBUTING.md) file.
 
 ## 🗺️ Roadmap
 
-* Add documentation for coroutines extensions that the library provides
 * Make publication about using state machines along with `MVI`
 * Create `Intellij IDEA Plugin` for state machine visualization and edition
 * Add default implementation of Serializable Events using `kotlinx.serialization`