chore: rename master branch to main

Author: mpalourdio

README.md

@@ -1,7 +1,7 @@
 # ng-http-loader
 
 [![CI](https://github.com/mpalourdio/ng-http-loader/actions/workflows/main.yml/badge.svg)](https://github.com/mpalourdio/ng-http-loader/actions/workflows/main.yml)
-[![Coverage Status](https://coveralls.io/repos/github/mpalourdio/ng-http-loader/badge.svg?branch=master)](https://coveralls.io/github/mpalourdio/ng-http-loader?branch=master)
+[![Coverage Status](https://coveralls.io/repos/github/mpalourdio/ng-http-loader/badge.svg?branch=main)](https://coveralls.io/github/mpalourdio/ng-http-loader?branch=main)
 [![npm](https://img.shields.io/npm/v/ng-http-loader.svg)](https://www.npmjs.com/package/ng-http-loader)
 [![npm](https://img.shields.io/npm/dm/ng-http-loader.svg)](https://www.npmjs.com/package/ng-http-loader)
 [![npm](https://img.shields.io/npm/dt/ng-http-loader.svg)](https://www.npmjs.com/package/ng-http-loader)