Update README.md

README.md

@@ -1,4 +1,4 @@
-![Build](https://github.com/DigitalCampus/oppia-mobile-app/actions/workflows/ci.yml/badge.svg?branch=master)
+![Build](https://github.com/DigitalCampus/oppia-mobile-app/actions/workflows/ci.yml/badge.svg?branch=main)
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=DigitalCampus_oppia-mobile-app&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=DigitalCampus_oppia-mobile-app)
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=DigitalCampus_oppia-mobile-app&metric=coverage)](https://sonarcloud.io/summary/new_code?id=DigitalCampus_oppia-mobile-app)
 [![ktlint](https://img.shields.io/badge/ktlint%20code--style-%E2%9D%A4-FF4081)](https://pinterest.github.io/ktlint/)
@@ -15,4 +15,4 @@ https://oppiamobile.readthedocs.io/en/latest/
 
 Questions, problems or issues? Please visit our community site:
 
-https://community.oppia-mobile.org/
+https://community.oppia-mobile.org/