Update README.md

Author: juliomrqz

README.md

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+> **⚠️ IMPORTANT:** This module is under maintenance mode, that means that new features are not developed but bug fixes are adressed.
+> **ℹ️ NOTE:** For Nuxt v3, it's recommended the Official Nuxt Image Module https://github.com/nuxt/image
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 # :sunrise: :rocket: Nuxt Optimized Images
 
 Automatically optimizes images used in Nuxt.js projects (JPEG, PNG, SVG, WebP and GIF).