Update README.md

Author: cuppachino

README.md

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 # 📘️ @cuppachino/openapi-fetch
 
+## Changes from upstream
+
+*   ✅ Fixed ESM/CJS support for browsers and node.
+
 [![version(scoped)](https://img.shields.io/npm/v/@cuppachino/openapi-fetch.svg)](https://www.npmjs.com/package/@cuppachino/openapi-fetch)
 
 A typed fetch client for [openapi-typescript](https://github.com/drwpow/openapi-typescript)