Update README.md

Author: morewings

README.md

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 [css-vars-hook](https://github.com/morewings/css-vars-hook) contains React hooks to set and manipulate CSS custom properties from React component.
 
 [Demo](https://morewings.github.io/css-vars-hook/)
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 [dev.to article](https://dev.to/morewings/how-to-use-css-vars-hook-to-manipulate-css-custom-properties-in-react-38dg)
 
 ## Install