Update README

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Author: rainboyan

README.md

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 # Grace Events Framework
 
 This project contains APIs and libraries that integrate Grace with various asynchronous libraries and frameworks such as [GPars](https://github.com/GPars/GPars) and [RxJava](https://github.com/ReactiveX/RxJava/tree/1.x), [RxJava2](https://github.com/ReactiveX/RxJava/releases/tag/v2.2.21), [RxJava3](https://github.com/ReactiveX/RxJava/releases).
 
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+> [!IMPORTANT]
+> Since 7.0, `grace-plugin-events` have been merged into the [Grace framework](https://github.com/graceframework/grace-framework/tree/2024.0.x/grace-plugin-events).
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 ## Versions
 
 To make it easier for users to use and upgrade, Plugin adopts a version policy consistent with the [Grace Framework](https://github.com/graceframework/grace-framework).