Update README.md

Author: dsinghvi

README.md

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 # CodeCombat Node Library
 
 [![npm shield](https://img.shields.io/npm/v/@fern-api/codecombat)](https://www.npmjs.com/package/@fern-api/codecombat)
+[![fern shield](https://img.shields.io/badge/%F0%9F%8C%BF-SDK%20generated%20by%20Fern-brightgreen)](https://github.com/fern-api/fern)
 
 The CodeCombat Node.js library provides access to the CodeCombat API from JavaScript/TypeScript.