Update README.md

Author: lijy91

README.md

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 This plugin allows Flutter **desktop** apps to Retrieve information about screen size, displays, cursor position, etc.
 
-[![Discord](https://img.shields.io/badge/discord-%237289DA.svg?style=for-the-badge&logo=discord&logoColor=white)](https://discord.gg/vba8W9SF)
+[![Discord](https://img.shields.io/badge/discord-%237289DA.svg?style=for-the-badge&logo=discord&logoColor=white)](https://discord.gg/zPa6EZ2jqb)
 
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