Merge pull request reef-pi#2291 from reef-pi/badge_fixes

(chore)fix master branch references

README.md

@@ -3,14 +3,14 @@
 An open source reef tank controller based on Raspberry Pi
 
 [![GitHub release](https://img.shields.io/github/release/reef-pi/reef-pi.svg)](https://github.com/reef-pi/reef-pi/releases)
-![Build Status(backend)](https://github.com/reef-pi/reef-pi/workflows/go/badge.svg?branch=master)
-![Build Status(frontend)](https://github.com/reef-pi/reef-pi/workflows/jest/badge.svg?branch=master)
-![Build Status(smoke)](https://github.com/reef-pi/reef-pi/workflows/smoke/badge.svg?branch=master)
-![Build Status(package)](https://github.com/reef-pi/reef-pi/workflows/deb/badge.svg?branch=master)
+![Build Status(backend)](https://github.com/reef-pi/reef-pi/workflows/go/badge.svg?branch=main)
+![Build Status(frontend)](https://github.com/reef-pi/reef-pi/workflows/jest/badge.svg?branch=main)
+![Build Status(smoke)](https://github.com/reef-pi/reef-pi/workflows/smoke/badge.svg?branch=main)
+![Build Status(package)](https://github.com/reef-pi/reef-pi/workflows/deb/badge.svg?branch=main)
 
-[![Coverage Status](https://codecov.io/gh/reef-pi/reef-pi/branch/master/graph/badge.svg)](https://codecov.io/gh/reef-pi/reef-pi)
+[![Coverage Status](https://codecov.io/gh/reef-pi/reef-pi/branch/main/graph/badge.svg)](https://codecov.io/gh/reef-pi/reef-pi)
 [![Go Report Card](https://goreportcard.com/badge/reef-pi/reef-pi)](https://goreportcard.com/report/reef-pi/reef-pi)
-[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/reef-pi/reef-pi/blob/master/LICENSE.txt)
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/reef-pi/reef-pi/blob/main/LICENSE.txt)
 [![GoDoc](https://godoc.org/github.com/reef-pi/reef-pi?status.svg)](https://godoc.org/github.com/reef-pi/reef-pi)
 
 ## Introduction