Move to master to main

Author: stronk7

README.md

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 # moodle-db-mssql: Microsoft SQL Server for Moodle
-[![Build Status](https://github.com/moodlehq/moodle-db-mssql/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/moodlehq/moodle-db-mssql/actions/workflows/ci.yml)
+[![Build Status](https://github.com/moodlehq/moodle-db-mssql/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/moodlehq/moodle-db-mssql/actions/workflows/ci.yml)
 
 A Microsoft SQL Server for Linux instance configured for Moodle development. Based on [mcr.microsoft.com/mssql/server](https://hub.docker.com/_/microsoft-mssql-server)