Update README.md

Author: agoose77

README.md

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 This package provides two Hatch plugins:
 - [version source plugin](https://hatch.pypa.io/latest/plugins/version-source/) that reads/writes the package version from the `version` field of the NodeJS `package.json` file.
-- [metadata hook plugin](https://hatch.pypa.io/latest/plugins/version-source/) that reads PEP 621 metadata from the NodeJS `package.json` file.
+- [metadata hook plugin](https://hatch.pypa.io/latest/plugins/metadata-hook/) that reads PEP 621 metadata from the NodeJS `package.json` file.
 
 
 **Table of Contents**