Update README.md

Signed-off-by: RitaDias <[email protected]>

Author: RitaDias

README.md

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 # Mux Video Input Sanity Plugin
 
-> This is a **Sanity Studio v3** plugin.
 > For the v2 version, please refer to the [v2-branch](https://github.com/sanity-io/sanity-plugin-mux-input/tree/studio-v2).
 
 This plugin lets you use [Mux](https://www.mux.com) video assets in your Sanity studio.