Update README.md

Author: thomaskimura

README.md

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 # Paper
 
-[Join Discord](https://discord.gg/NeSWQWCh) / [Download theme](https://themes.shopify.com/themes/paper/styles/poster) / [Become an affiliate](https://brickspacelab.notion.site/Paper-partner-program-4f3da78aff844b43badce89b570777a6)
+[Join Discord](https://discord.gg/4qdBFhmzCR) / [Download theme](https://themes.shopify.com/themes/paper/styles/poster) / [Become an affiliate](https://brickspacelab.notion.site/Paper-partner-program-4f3da78aff844b43badce89b570777a6)
 
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