Update README.md

Author: preetkaran20

README.md

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 # owasp-zap-fileupload-addon 
-[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com) ![Java CI with Gradle](https://github.com/SasanLabs/owasp-zap-fileupload-addon/workflows/Java%20CI%20with%20Gradle/badge.svg?branch=master)
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com) ![Java CI with Gradle](https://github.com/SasanLabs/owasp-zap-fileupload-addon/workflows/Java%20CI%20with%20Gradle/badge.svg?branch=main)
 
 This project contains the File Upload scan rule which is used to find the vulnerabilities in File Upload functionality.