Update README.md

Author: abhinav-codealchemist

README.md

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 [![license](https://img.shields.io/github/license/abhinav-codealchemist/http-wrapper-go.svg?style=flat-square)](https://github.com/abhinav-codealchemist/http-wrapper-go/blob/main/LICENSE)
 
 A light wrapper over Go's HTTP client
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+Detailed explanation: https://medium.com/codealchemist/a-lightweight-wrapper-over-gos-http-client-1b915e7de564