Update README.md

typo

Author: stefanmeschke

README.md

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 :rocket: ProductHunt: https://producthunt.com/posts/swagger-codegen :rocket:
 
-:notebook_with_decorative_cover: The eBook [A Beginner's Guide to Code Generation for REST APIs](https://gumroad.com/l/swagger_codegen_beginner) is a good starting point for begineers.
+:notebook_with_decorative_cover: The eBook [A Beginner's Guide to Code Generation for REST APIs](https://gumroad.com/l/swagger_codegen_beginner) is a good starting point for beginners.
 
 ## Overview
 This is the swagger codegen project, which allows generation of API client libraries (SDK generation), server stubs and documentation automatically given an [OpenAPI Spec](https://github.com/OAI/OpenAPI-Specification). Currently, the following languages/frameworks are supported: