added github action badge

Author: wumpz

README.md

@@ -1,6 +1,8 @@
 # JSqlParser
 
-[![Build Status](https://travis-ci.com/JSQLParser/JSqlParser.svg?branch=master)](https://travis-ci.com/JSQLParser/JSqlParser)   [![Coverage Status](https://coveralls.io/repos/JSQLParser/JSqlParser/badge.svg?branch=master)](https://coveralls.io/r/JSQLParser/JSqlParser?branch=master)
+![Build Status](https://github.com/JSQLParser/JSqlParser/actions/workflows/maven.yml/badge.svg)
+
+[![Build Status (Legacy)](https://travis-ci.com/JSQLParser/JSqlParser.svg?branch=master)](https://travis-ci.com/JSQLParser/JSqlParser)   [![Coverage Status](https://coveralls.io/repos/JSQLParser/JSqlParser/badge.svg?branch=master)](https://coveralls.io/r/JSQLParser/JSqlParser?branch=master)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/6f9a2d7eb98f45969749e101322634a1)](https://www.codacy.com/gh/JSQLParser/JSqlParser/dashboard?utm_source=github.com&utm_medium=referral&utm_content=JSQLParser/JSqlParser&utm_campaign=Badge_Grade)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.jsqlparser/jsqlparser/badge.svg)](http://maven-badges.herokuapp.com/maven-central/com.github.jsqlparser/jsqlparser)
 [![Javadocs](https://www.javadoc.io/badge/com.github.jsqlparser/jsqlparser.svg)](https://www.javadoc.io/doc/com.github.jsqlparser/jsqlparser)