Renamed master branch to main (#503)

For consistency.

.github/workflows/build.yml

@@ -10,10 +10,10 @@
 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 # copies of the Software, and to permit persons to whom the Software is
 # furnished to do so, subject to the following conditions:
-# 
+#
 # The above copyright notice and this permission notice shall be included in
 # all copies or substantial portions of the Software.
-# 
+#
 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
@@ -27,7 +27,7 @@ name: Build
 on:
   push:
     branches:
-      - master
+      - main
 
 jobs:
   build:

README.md

@@ -2,7 +2,7 @@
 
 [![Release](https://github.com/gantsign/ktlint-maven-plugin/workflows/Build/badge.svg)](https://github.com/gantsign/ktlint-maven-plugin/actions?query=workflow%3ABuild)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.gantsign.maven/ktlint-maven-plugin/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.github.gantsign.maven/ktlint-maven-plugin)
-[![codecov](https://codecov.io/gh/gantsign/ktlint-maven-plugin/branch/master/graph/badge.svg)](https://codecov.io/gh/gantsign/ktlint-maven-plugin)
+[![codecov](https://codecov.io/gh/gantsign/ktlint-maven-plugin/branch/main/graph/badge.svg)](https://codecov.io/gh/gantsign/ktlint-maven-plugin)
 [![Known Vulnerabilities](https://snyk.io/test/github/gantsign/ktlint-maven-plugin/badge.svg)](https://snyk.io/test/github/gantsign/ktlint-maven-plugin)
 
 This plugin provides the ability to use