Documentation : Help to solve a deployment bug (#152)

* Documentation : Help to solve a deployment bug
* Update README.md

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Co-authored-by: Florentin / 珞辰 <ecklf@icloud.com>

Author: abcd-ca

README.md

@@ -104,6 +104,8 @@ target/
 
 **Step 5** — You're all set. Run `vercel dev` to develop your project locally. You can connect a Git repository to Vercel, or use `vercel` to start deploying your project on Vercel.
 
+Should you encounter an "invalid runtime" error when deploying to Vercel, it may be rectified by downgrading your project's NodeJS version from v20 to v18. This is due to a compatibility issue with the build image, which can be further understood by visiting this [link](https://vercel.com/docs/deployments/build-image#runtime-support). You can modify the NodeJS version through the Vercel admin dashboard by navigating to Projects > Your Project, then selecting Settings. Scroll down to the "Node.js Version" header to make the necessary changes.
+
 ## Advanced Usage
 
 ### Toolchain Overrides