Update README.md

Author: eahefnawy

README.md

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+> [!IMPORTANT]  
+> The Serverless Framework now has built-in support for the log retention setting. [For more information please refer to the official documentation](https://www.serverless.com/framework/docs/providers/aws/guide/serverless.yml#general-aws-lambda-settings). This plugin should no longer be needed.
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 # serverless-plugin-log-retention
 Control the retention of your serverless function's cloudwatch logs.