Branch renaming: master -> main

Signed-off-by: Andreas Schmid <service@aaschmid.de>

CONTRIBUTING.md

@@ -30,7 +30,7 @@ We love pull requests. Here is a quick guide:
 
 1. You need to have a JDK (at least version 1.8) installed.
 2. Fork the repo (see https://help.github.com/articles/fork-a-repo).
-3. Create a new branch from master.
+3. Create a new branch from `main`.
 4. Ensure that you have a clean state by running `./gradlew clean build`.
 5. Add your change together with a test (tests are not needed for refactorings and documentation changes).
 6. Run `./gradlew clean build` again and ensure all tests are passing.

README.md

@@ -1,9 +1,9 @@
-[![Travis CI](https://travis-ci.org/TNG/junit-dataprovider.png?branch=master)](https://travis-ci.org/TNG/junit-dataprovider)
+[![Travis CI](https://travis-ci.org/TNG/junit-dataprovider.png?branch=main)](https://travis-ci.org/TNG/junit-dataprovider)
 [![Circle CI](https://circleci.com/gh/TNG/junit-dataprovider.svg?style=svg)](https://circleci.com/gh/TNG/junit-dataprovider)
-[![Coverage Status](https://coveralls.io/repos/TNG/junit-dataprovider/badge.png?branch=master)](https://coveralls.io/r/TNG/junit-dataprovider)
+[![Coverage Status](https://coveralls.io/repos/TNG/junit-dataprovider/badge.png?branch=main)](https://coveralls.io/r/TNG/junit-dataprovider)
 [![codebeat badge](https://codebeat.co/badges/78ac5f0b-6686-4d77-a531-d562c8485474)](https://codebeat.co/projects/github-com-tng-junit-dataprovider)
 [![Maven Central](https://img.shields.io/maven-central/v/com.tngtech.junit.dataprovider/junit-dataprovider-core.svg)](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22com.tngtech.junit.dataprovider%22)
-[![License](https://img.shields.io/github/license/TNG/junit-dataprovider.svg)](https://github.com/TNG/junit-dataprovider/blob/master/LICENSE)
+[![License](https://img.shields.io/github/license/TNG/junit-dataprovider.svg)](https://github.com/TNG/junit-dataprovider/blob/main/LICENSE)
 [![Issues](https://img.shields.io/github/issues/TNG/junit-dataprovider.svg)](https://github.com/TNG/junit-dataprovider/issues)
 [![Forks](https://img.shields.io/github/forks/TNG/junit-dataprovider.svg)](https://github.com/TNG/junit-dataprovider/network)
 [![Stars](https://img.shields.io/github/stars/TNG/junit-dataprovider.svg)](https://github.com/TNG/junit-dataprovider/stargazers)