chore: rename master to main (#206)

Author: Fdawgs

.github/workflows/ci.yml

@@ -4,7 +4,6 @@ on:
   push:
     branches:
      - main
-     - master
      - next
      - 'v*'
     paths-ignore:

.github/workflows/package-manager-ci.yml

@@ -4,7 +4,6 @@ on:
   push:
     branches:
      - main
-     - master
      - next
      - 'v*'
     paths-ignore:

README.md

@@ -1,7 +1,7 @@
 # @fastify/swagger-ui
 
 [![NPM version](https://img.shields.io/npm/v/@fastify/swagger-ui.svg?style=flat)](https://www.npmjs.com/package/@fastify/swagger-ui)
-[![CI](https://github.com/fastify/fastify-swagger-ui/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/fastify/fastify-swagger-ui/actions/workflows/ci.yml)
+[![CI](https://github.com/fastify/fastify-swagger-ui/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/fastify/fastify-swagger-ui/actions/workflows/ci.yml)
 [![neostandard javascript style](https://img.shields.io/badge/code_style-neostandard-brightgreen?style=flat)](https://github.com/neostandard/neostandard)
 
 A Fastify plugin for serving [Swagger UI](https://swagger.io/tools/swagger-ui/).